1) Child superhero 2) Gang in fiction 3) PlayStation 4 game 4) Visual novel 
Punch lines generally derive their humor from being unexpected. The classic stand-up punch line sound is a sting (erroneously called a rimshot) on drums. ==Etymology== The origin of the term punchline is actually a mystery to etymologists. Some sources suggest the first published use of `punchline` or `punch line` to describe the pay-off line ...[ice hockey] The Punch line was a famous ice hockey line for the Montreal Canadiens in the 1940s. It consisted of Elmer Lach at center, Toe Blake on left wing, and Maurice Richard on the right side. During their time together, they led the Canadiens to two Stanley Cup victories. During the 1944–45 NHL season, the three finished first (Lac...
the line that is supposed to derive the laughter from the audience. 
[n] - the point of a joke or humorous story
laugh line noun the point of a joke or humorous story
the second part of a joke that contains a
(same as punch).
the climactic phrase or sentence in a joke, speech, advertisement, or humorous story that produces the desired effect.