Alien Father Uses His Stink Gun is a short from the episode The Iron Giant Lady / Raising a New Hope.
Summary[]
Kids these days.
Transcript[]
(The sketch starts with two young aliens pretending to be in a gun fight. Their father notices)
Alien Father: What is this "pew pew pew" business? That's not what a gun sounds like.
(The alien father pulls out his stink gun and uses it, causing it to emit a bad odor)
Alien Father: Now that's a gun.
Alien Child: (disgusted) eww.
(The sketch ends)