the first porn film i ever saw back in the 80s was a piss take of that guy who shot the muggers on an american tube train. a white guy is sitting down reading a paper while three black girls are watching him. one then walks over to him and says 'he mister, have you got five dollars?' to which, lowering his paper to reveal his cock, he says 'no, but i've got five inches' etc etc.
the second is one i really wish i'd never got rid of. two women are sitting down talking about their fantasies and agree that they'd both like to seduce a really nerdy, innocent type of guy. the doorbell then rings and one of them goes to open it. standing at the door is peter north (i think) with really nerdy taped together glasses and a copy of the bible. he says 'i'm from the church on the road down the way and i'd like to tell you the story about moses and the burning bush'. he's invited in, sits down between the two of them and proceeds to tell the bible story, only for one of them to interrupt him with the line 'well both of us have burning bushes and they're very, very hot'...