What are the best movie quotes?

Question by Cassie: What are the best movie quotes?
I want to make list of the best movie quotes. I have many Tyler Durden (Fight club) and other as well. Do you know any good ones? Please include movie it is from and who said it. Thank you!

Best answer:

Answer by Bomb That Cherry™
Why So Serious? – The Joker in The Dark Knight

E.T. Phone Home – E.T. in E.T.

I See Dead People – Cole in The Sixth Sense

Know better? Leave your own answer in the comments!