"You think anyone wants a roundhouse kick to the face while I'm wearing these bad boys? Forget about it!" - Napoleon Dynamite
Actually, I quote Napoleon Dynamite all the time. For some dumb reason, I think "Make yourself a dang quesadilla!" and "Your mom goes to college!" is hilarious.
"I ain't got time to bleed." - Predator
"No matter where you go, there you are." Buckaroo Bonzai
"How do you like to kiss?" - Hatari! (best pickup line ever)
"I've got a lot of friends." to Doc Holliday followed by his response, "I don't." from Tombstone. Another movie I could quote all day long.
"Bye, Felicia." - Friday. I mean, that's just so useful.
"Back door, huh? Good idea!" - Return of the Jedi (OK, maybe not really that one...)