On the Thursday night schedule for the Republican National Convention, there is a big old space marked "To Be Announced" and the speculation is going today about who might be the super secret "mystery guest." According to Sara Libby of Talking Points Memo, "top advisers to Mitt Romney's presidential campaign" -- including Romney veep-vetter Beth Myers and senior aide Eric Fehrnstrom -- say that they "have no knowledge" of who it might be. (Which is highly unlikely, but whatever.)

Whoever the "mystery guest" is, he or she or they or it will appear between a musical performance from American Idol-winner Taylor Hicks and Sen. Marco Rubio of Florida. In terms of building a "narrative" with the evening, in which each new moment builds on the last in an arc of rising action, you could theoretically put just about anyone between those two. You could, for example, announce, "That was Taylor Hicks, ladies and gentlemen! Now please welcome [INSERT NAME OF ANY OTHER KNOWN SINGER]!" (Probably not Tom Morello, though.)

But the lion's share of speculation is centered on the possibility that Sarah Palin, who has thus far been excluded, might show up and repeat the rousing oration she provided convention attendees in 2008. If that happens, it will give the commentariat a chance to opine that the "decision seemed to stray from the task of selling Romney to independent voters, gargle gargle blargh."

Ask anyone at the convention what they think, though, and Palin is near the top of the list. Also being freely bandied about is the possibility that it could be a Cheney (Dick or Liz), a Bush (George H.W., not the other one), or a Reagan (Nancy).

Maybe the mystery guest will be Vice President Joe Biden! Like, they trick him, or something.

Dave Weigel noted today that the words "Tea Party," have not yet been said aloud on the convention stage. It seems sort of inexplicable that the convention organizers would not, in some way, pay tribute to the movement that helped propel them back to a majority in the House of Representatives. But it's not clear how they would honor the Tea Party with a "mystery guest," short of having Rick Santelli make an appearance. They could, perhaps, continue the theme of the first night, and bring ordinary, unacclaimed Tea Party activists on stage to address the crowd in the same way they had small business owners take the stage last night. (The theme of Thursday night's festivities is "We Believe In America.")

Fox News is reporting that a reliable source has said that the TBA speaker will be Clint Eastwood, who famously narrated the "Halftime In America" Super Bowl commercials that many on the right accused of having a pro-Obama bias. That same Fox News report also offers some speculation that it could be New York Jets benchwarmer Tim Tebow, who would stand a pretty good chance of completing a pass if he just hurled it into the crowd. It will probably not be Donald Trump, because if it was, he would have already given away the surprise by being really obvious about it on Twitter.

I am just going to bet all my weird Tampa Bay Convention Center Fun Bucks that it's just going to be another Spice Girls reunion, but you can leave your guesses in the comments.

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  • Republican vice presidential nominee, Rep. Paul Ryan, left and Republican presidential nominee Mitt Romney waves to delegates after his speech at the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Charlie Neibergall)

  • Republican presidential nominee Mitt Romney acknowledges delegates before speaking at the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Jae C. Hong)

  • Republican vice presidential nominee, Rep. Paul Ryan and his wife Janna salute delegates following Republican presidential nominee Mitt Romney's speech during the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. Behind is Mitt Romney and his wife Ann. (AP Photo/Charlie Neibergall)

  • Mitt Romney

    Republican presidential nominee Mitt Romney waves to delegates before speaking at the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/David Goldman)

  • Mitt Romney

    Republican presidential nominee Mitt Romney acknowledges delegates before speaking at the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/David Goldman)

  • Mitt Romney

    Republican presidential nominee Mitt Romney addresses the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/J. Scott Applewhite)

  • Mitt Romney

    Republican presidential nominee Mitt Romney hugs a supporter as he walks to the stage during the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/J. Scott Applewhite)

  • Republican presidential nominee Mitt Romney makes his way through delegates before speaking at the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Charlie Neibergall)

  • Ann Romney, wife of U.S. Republican presidential nominee Mitt Romney, cheers as Olympians are introduced during the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Charlie Neibergall)

  • Republican vice presidential nominee, Rep. Paul Ryan, right, and his wife Janna applaud during Florida Senator Marco Rubio's speech during the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Lynne Sladky)

  • Republican vice presidential nominee, Rep. Paul Ryan, right, along with Ann Romney, wife of U.S. Republican presidential nominee Mitt Romney, left, applaud during Florida Senator Marco Rubio's speech at the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Lynne Sladky)

  • Marco Rubio

    Florida Senator Marco Rubio addresses the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Charles Dharapak)

  • Florida Senator Marco Rubio addresses delegates during the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Charlie Neibergall)

  • Marco Rubio

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  • Clint Eastwood

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  • Tom Stemberg, founder and former CEO of Staples speaks to delegates during the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Charlie Neibergall)

  • Bob White

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  • Frantz Placide and Sean Duffy, center, listen to Former Florida Governor Jeb Bush, left, as he speaks during the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012.during the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Lynne Sladky)

  • Jeb Bush

    Former Florida Governor Jeb Bush addresses the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Jae C. Hong)

  • Former Florida Governor Jeb Bush steps onstage to speak to delegates at the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Lynne Sladky)

  • Oscar Poole

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  • Newt Gingrich, Callista Gingrich

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  • Former House Speaker Newt Gingrich and his wife Callista walk onto the stage to speak to delegates during the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Charlie Neibergall)

  • Former House Speaker Newt Gingrich and his wife Callista speak to delegates during the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Charlie Neibergall)

  • Herman Cain recites the Pledge of Allegiance during the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Charlie Neibergall)

  • Connie Mack

    Rep. Connie Mack, R-Fla., addresses the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/J. Scott Applewhite)

  • Senator Scott Brown, R-Mass., answers questions during a press conference in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Patrick Semansky)

  • Stagehands make final adjustments to the expanded stage where Republican presidential nominee Mitt Romney will accept his party's nomination later tonight a the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/Jae C. Hong)

  • Protesters yell as Republican vice presidential nominee, Rep. Paul Ryan addresses the Republican National Convention in Tampa, Fla., on Wednesday, Aug. 29, 2012. (AP Photo/Jae C. Hong)

  • A delegate holds up a mask of Republican vice presidential nominee, Rep. Paul Ryan during the Republican National Convention in Tampa, Fla., on Wednesday, Aug. 29, 2012. (AP Photo/David Goldman)

  • Jeb Bush

    FILE In this Aug. 27, 2012 file photo, former Florida Gov. Jeb Bush looks at the convention floor from the podium during a microphone check at the Republican National Convention in Tampa, Fla. (AP Photo/J. Scott Applewhite, File)

  • Stagehands make final adjustments to the expanded stage where Republican presidential nominee Mitt Romney will accept his party's nomination later tonight a the Republican National Convention in Tampa, Fla., on Thursday, Aug. 30, 2012. (AP Photo/J. Scott Applewhite)

  • Paul Ryan

    Republican vice presidential nominee, Rep. Paul Ryan waves toward the delegates during the Republican National Convention in Tampa, Fla., on Wednesday, Aug. 29, 2012. (AP Photo/J. Scott Applewhite)

  • Paul Ryan

    Republican vice presidential nominee, Rep. Paul Ryan addresses the Republican National Convention in Tampa, Fla., on Wednesday, Aug. 29, 2012. (AP Photo/J. Scott Applewhite)

  • Sam Ryan yawns in his mother's arms while Janna listen to her husband Republican vice presidential nominee, Rep. Paul Ryan's speech during the Republican National Convention in Tampa, Fla., on Wednesday, Aug. 29, 2012. Right is Charlie Ryan. (AP Photo/Charlie Neibergall)

  • Ann Romney, wife of U.S. Republican presidential nominee Mitt Romney, applauds with Republican vice presidential nominee, Rep. Paul Ryan's wife during Paul Ryan's speech during the Republican National Convention in Tampa, Fla., on Wednesday, Aug. 29, 2012. (AP Photo/Charlie Neibergall)

  • Republican vice presidential nominee, Rep. Paul Ryan speaks to delegates during the Republican National Convention in Tampa, Fla., on Wednesday, Aug. 29, 2012.(AP Photo/Charlie Neibergall)

  • Condoleezza Rice

    Former Secretary of State Condoleezza Rice addresses the Republican National Convention in Tampa, Fla., on Wednesday, Aug. 29, 2012. (AP Photo/Charles Dharapak)

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    New Mexico Governor Susana Martinez addresses the Republican National Convention in Tampa, Fla., on Wednesday, Aug. 29, 2012. (AP Photo/J. Scott Applewhite)

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    Former governor of Arkansas Mike Huckabee addresses the Republican National Convention in Tampa, Fla., on Wednesday, Aug. 29, 2012. (AP Photo/J. Scott Applewhite)

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    Former governor of Arkansas Mike Huckabee addresses the Republican National Convention in Tampa, Fla., on Wednesday, Aug. 29, 2012. (AP Photo/J. Scott Applewhite)

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  • Rob Portman

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