Monty Python & the Holy Grail, sung by the minstrel: "Sir Robin bravely ran away".
Monty Python & the Holy Grail, in the castle: "Yes, and then spank me, yes, and then me, yes, and then the <censored>".
So I Married an Axe Murderer: Mike Myers singing the Rod Stewart song "Do You Think I'm Sexy" while in character as Stuart Mackenzie, (an old Scottish guy) all the while being backed-up by a chorus of bagpipes.
So I Married an Axe Murderer: Mike Myers in character as Stuart Mackenzie, rambling on for approximately 5 minutes about how big his son's head is: "It's huge. It's a planetoid. It has it's own weather system. It's like Sputnik, quite round but rather pointy in parts".
Austin Powers; International Man of Mystery: The 1st time that Dr. Evil asks for "1 million dollars".
CaddyShack; Rodney Dangerfield to Ted Knight (Judge Smails): "That's a nice hat. You should get a bowl of soup when you buy that hat. Looks good on you though".
Back to School; Rodney Dangerfield: The Triple Lindy.
And finally, (before I get back to work):
Eurotrip, the "Scotty Doesn't Know" part. /ubbthreads/images/graemlins/smile.gif