This skit is from the episode So You Think You Can Train Your Dragon How to Dance / Yo Gagga Gagga!.
Announcer: This week on "The Man who Forgot his Hand is a Bomb"...
(in park) Person: Hey, man. I totally aced that test!
Man: High five! No, wait-
(playing Twister) Person: Alright, right hand green.
Man: I got it!
(while playing baseball, someone throws a ball) Man: I got it!
(a fly buzzes around, the man swats it with the bomb hand)
Waitress: Careful, that coffee's hot.
Man: I know. I almost burnt my li-
(making a buisness deal) Boss: Sir, you have yourself a deal. Let's shake on it. No wait, I have a cold. We should fist bump!
Man: No, wait!
Announcer: "The Man who Forgot his Hand is a Bomb"! Now entering its 4th season.