I don't have the statistics to back me up, but I believe Airplane! is the most quoted film...at least in my generation. Because I am a geek and had no life, I remember spending hours with my friends trading quotes back and forth. I still do it today, in fact, though somewhat diminished as time passes. It sucks getting old. But Ted Striker stated it best..."what a pisser."
McCroskey: "Johnny, what can you make out of this?"
Johnny: "Why, I can make a hat or a brooch or pterodactyl..."
boy: "cream?"
girl: "no, thank you. I take it black. Like my men."
"You ever seen a grown man naked?"
Doctor: "this woman has to get to a hospital."
Elaine: "A hospital? What is it?"
Doctor: "It's a big building with patients. But that's not important right now."