Yeah, that's a good one. Also from Home Alone 2: "Turtle doves." Just because of the way he says it. I still kinda think Mr. Duncan is a pedophile though.
But the best movie quote is "LIVE OR DIE, MAN?!" from Karate Kid 2. Just because that scene is so ridiculous, and it's funny to hear Ralph Macchio pretending to be an actual martial arts action star for a second.