I hate it when sitcoms or... any other form of comic entertainment... employ porn puns. Like, par exemple, in Friends:
Good Will Humping
Shaving Ryans Privates
Sex Toy Story 2
Lawrence of Alabia
^All the above used in Friends.
I will allow them Buffay the Vampire Layer, beacause that's quite funny and is at least relevvant to the character.
Any more examples?
(Or exemples, as I pretentiously phrased it earliere?)