Mine are:
Peter (when he's hungover): This sucks worse than that time I went to that museum. (Flashback to childhood, standing in museum looking at dinosaur
skeltons.)
Peter (as a child): Why did all the dinosaurs die out?
Man at Museum: Because you touch yourself at night.
And
Auctioner: Our first item is a pair of panties confiscated from a prostitute.
Quagmire: Fifty bucks.
Auctioner: She had nine STDs.
Quagmire: Forty-five bucks.
Auctioner: And when we caught her she wet herself.
Quagmire: Fifty bucks.