An extremely corny punchline.
A combination of
Falcon Punch and Punchline.
Falcon punch originated from the character Captain Falcon starring in the video game
F-Zero. His character was later used in the popular Nintendo game Super Smash Brothers. His signature move in the game,
the Falcon Punch, is used as a term for an extreme punch. This combines with punchline to express an "extreme punchline".
Bob: Why was there a
fence around
the graveyard?
Tom: I don't know, why?
Bob: People were dying to get in!
Tom: Now that's a
falcon punchline.