i love movie quotes! here are some of my favorites
"Insanity runs in my family. It practically gallops."
from Arsenic and Old Lace. i always use it when i'm talking about my family.
"Was you ever bit by a dead bee?" from To Have and Have Not.
"The prettiest sight in this fine, pretty world is the privileged class enjoying its privileges. " from The Philadelphia Story.
"Don't be so gloomy. After all it's not that awful. It's what the fellow said - in Italy for 30 years under the Borgias they had warfare, terror, murder, and bloodshed, but they produced Michelangelo, Leonardo da Vinci, and the Renaissance. In Switzerland they had brotherly love - they had 500 years of democracy and peace, and what did that produce? The cuckoo clock." from The Third Man. it's really long but it makes you think and it's kind of funny.
that's all i can think of on the spot but there are many more.