Thank you BigMurph26 for making this gif.
Stashed in: Reaction GIFs!, G4!, MRW, gifs, Explosions!, High Quality gifs, Awesome, BigMurph26
HighQualityGifs is my new favorite subreddit.
Looks like Andy Kaufman... my favorite of his here:
Here's more about Tim and Eric: http://www.timanderic.com/