The most watched film in my house is The Emperor’s New Groove. We can quote a line from anywhere in the film and just keep going. We can spend an evening just quoting that film.
"Why do I even have that lever?"
"Yeah, that'll work."
"Funny, that usually works."
"It's not the first time I've been thrown out of a window, and it won't be my last!"
Anyway, you gotta see it to know.
A very close second is the eminently quotable Monty Python and the Holy Grail.
"When suddenly the animator suffered a fatal heart attack and the troupe was saved."
"No thanks, we've already got one."
"It's just a flesh wound."
"What do you burn besides witches?" "MORE witches!"
"She turned you into a newt?" "...I got better."
What's the film you can quote best?