This is an animated gif of an audience member's reaction to one of those "You are not the father!" shows, which are apart of The Maury Povich Show. This one is often used as a reaction gif because of how he excitedly leaps from his seat and has to be dragged back down.
EDIT: My bad, this is actually an audience member from Jerry Springer. This was after one of the people on the show said "I'll try anything once" after finding out that his girlfriend was actually a man.