Conan O'Brien's 'How I Met Your Mother' Cameo Surprises Viewers (VIDEO)

Twitter lit up Monday night when viewers spotted a very familiar-looking redheaded giant in the background of a new episode of "How I Met Your Mother." Yes, it looks like Conan O'Brien made an uncredited background appearance at MacLaren's on the CBS sitcom -- but only for a moment.

Earlier tonight, Neil Patrick Harris teased the cameo without going into details:

Watch the new episode of HIMYM tonight and try to spot the awesomest of dudes randomly hanging out at MacLaren's. #dontblink

— Neil Patrick Harris (@ActuallyNPH) February 20, 2012

Last June, "How I Met Your Mother" co-star Harris appeared on "Conan," and revealed that the TBS funnyman had won an auction at a charity function that allowed the winner to appear on "How I Met Your Mother" in a walk-on cameo role. During the interview, O'Brien said that the show's writers wanted to write a role for O'Brien, but he thought it would be funnier to appear in the background of the bar.

We captured a video above, but if you're just curious what an Irish talk show host looks like in an Irish bar, Twitter user Jeremy McGovern captured a photo of O'Brien's hidden cameo at the pub.

Also on HuffPost:

Comments

[Cloball]

07:16 AM on 02/22/2012

Love Conan. His fan base looks really young, but for some reason I've always loved him. When he put on that pair of jeggings, I thought I'd have to be locked up. Insane.

Plus, other comedians like him and that says something.

[ttbsdmmg]

03:49 AM on 02/22/2012

Conan made that show better just from those few seconds he appeared.

[stepintothelight]

11:37 PM on 02/21/2012

I actually rolled it back to check while I was watching last night. The height and the hair gave him away.

[NelsonC]

11:16 PM on 02/21/2012

Yup, there's nothing like a good cameo.

OMG! It's Conan \\ :- ,

Now I forgot what I was gonna say.

[ArkayMI]

08:45 PM on 02/21/2012

Conan was also on 'The Office' episode with Steve Carrell some time back as a pedestrian in NY.

[itzy8940]

06:45 PM on 02/21/2012

Totally missed it.

[siciliabel]

05:35 PM on 02/21/2012

I just KNEW that was Conan O'Brien. I saw him when I was watching the show last night. No one else looks quite like him.

[sinnerG7]

12:14 PM on 02/21/2012

Ya Know I watched that segment (House was at commercials)and didn't even noticed Conan.

[Pennsylvanianne]

04:08 PM on 02/21/2012

I completely agree. Didn't notice and don't really care because I don't care for Conan at all.

[Zach Benton]

10:59 PM on 02/21/2012

Why would you feel the need to comment then?

[kaysquare]

09:47 AM on 02/21/2012

I think most things he does are "odd".

[SCboy]

09:26 AM on 02/21/2012

The "awesomest of dudes"? Like, omg, what is this, middle school?

[thefredman63]

08:51 AM on 02/21/2012

After how many years, and he still hasnt met her? I wonder if the kids were born at all

[Hlynn]

04:48 PM on 02/21/2012

I just started watching the reruns of this and I can't believe how long this show has been on--the dates appear in the info bar--and how none of these characters seem to ever grow up; they're all so immature in every episode.

I did get caught up in the story, though, of how Ted finally meets the woman he marries when he starts dating someone from the university whose roommate is (supposedly) his future bride when objects--toy bus, yellow umbrella, all the things he likes he thougt belonged to his date but belonged to her roommate--were used as teasers.

I wish they would just get to the ending and tell us who it is. On the last show I saw Ted was trying to get back with Robin, but he already told his children in another episode that she is "Aunt Robin", so I hope the writers don't waste too much time with the Ted and Robin connection again since it's clearly not her.

[Courtney Hoffard]

05:46 PM on 02/21/2012

It's a tv show. A form of stupid entertainment. Who cares if they are immature in every epsiode? I use to watch all the time, but it was the same show over and over, so guess what? I stopped watching if all the time. Brilliant concept when one doesnt like something.

[thefredman63]

05:16 AM on 02/22/2012

Hlynn, its starting if not already to jump the shark. Friends wannabe, and I never liked friends either

[Natassha Halverson]

06:58 AM on 02/21/2012

I love Conan. That is all.

[janeway529]

01:28 AM on 02/21/2012

Haha, Conan doesn't really blend into the background. It's like playing an easy game of 'Where's Conan?'

[Steve Sedlis]

01:08 AM on 02/21/2012

Conan O'Brien is not funny. He wasnt funny in college, he wasnt funny on network, he isnt funny now.

[kekesididi]

02:40 AM on 02/21/2012

perhaps you just have no sense of humor. :D

[Pennsylvanianne]

04:10 PM on 02/21/2012

No, humor is very subjective. I love Jon Stewart, Stephen Colbert, Jerry Seinfeld, David Letterman. I know a lot of young people like Conan, but I find him very egotistical and unfunny.

[Just Don]

04:18 AM on 02/21/2012

That's some kind of bad post, Steve.

Oooooh, sorry, I couldn't resist.

[Steve Sedlis]

01:44 AM on 02/22/2012

I'm sorry, the man just tries too hard. I don't believe its the writing, or the format. I just think he tries too hard.

[chuckleboy]

12:14 AM on 02/21/2012

Conan seems to be disoriented !!! Perhaps someone had slipped him a mickey and something awful is about to happen to him. I am very concerned that he hasn't been abducted or something.

[boomcat44]

01:07 AM on 02/21/2012

It could be because he's not used to having that many people watching him............ouch.