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Not really a film insult but anyway I will put it here.

Woodstock Okay Banana nose

Snoopy Bananan Nose???!

Another Futurama one, sort of an insult to everyone who isn't Bender:

Bender: "My life, and by extension everyone else's is meaningless."

And the bestest ones ever:

"I fart in your general direction! Your mother was a hamster and your father smelt of elderberries! .... Now go away or I shall taunt you a second time!"

(from the Holy Grail)