Reddit comments: http://reddit.com/r/reactiongifs/comments/2wb1y9/mrw...
Stashed in: Reaction GIFs!, Zach Galifianakis, @tomcruise, Poker!, gifs, Mathy, Reaction Gifs, Hays, Lasse
Source is 30 seconds in:
It's a spoof of this scene from Rain Man:
From the Reddit comments is this lovely Shermans Lagoon comic:
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