“And by the way, a preposition is something you should never end a sentence with.”
SID SNOT: Hey, old man! Can you tell me where the bafroom’s at?
OLD MAN: Son, you should never end a sentence with a preposition!
SID SNOT: Er, okay. Can you tell me where the bafroom’s at, pillock?
That’s another oldie but a goodie. I heard it as:
SID SNOT: Er, okay. Can you tell me where the bafroom’s at, M....F.....?