Michael Morse Invisible Grand Slam: Nationals Slugger Forced To Reenact Home Run (VIDEO)

Has anyone ever seen this happen in baseball?

In the first inning against the St. Louis Cardinals on Saturday night, Nationals slugger Michael Morse hit a line drive to right field with the bases loaded. The ball cleared the outfield wall at Busch Stadium and then bounced back into the field of play off a sign just behind it. Only seeing the ball bounce back into the field, the umpires initially ruled the ball as "in play." The baserunners seemed confused and Morse was eventually tagged out in a rundown. After a review, however, the umpires ruled the hit a grand slam.. and that's when it happened.

Ryan Zimmerman, Bryce Harper and Adam LaRoche were sent back to their bases and Morse was sent all the way back the batter's box. Seemingly at the insistence of the umpires, the 30-year-old Morse circled the bases backwards. After arriving back at home plate (with his teammates back at the stations they began the at-bat), Morse took a phantom swing at the plate without a bat and then everyone ran the bases again.

"I've never seen this before in my life. This is unbelievable," the Nationals announcer marveled. "That is the greatest thing I've ever seen in my life."

Even Cardinals catcher Yadier Molina was laughing. But he probably wasn't as happy about those runs when the Nationals pulled out a 6-4 win in 10 innings.

For his performance, the official Twitter account of Major League Baseball declared Morse as the funniest man in baseball.