What's a really famous movie that everyone has seen except you?

Lots of super famous movies out there. No matter how good or bad, they have went down in the movie history.
Citizen Kane, Psycho, Titanic, The Exorcism, Terminator II, many others.
The question is, what is a very popular movie, known to all, that you haven’t seen?

I hadn’t seen Kill Bill until last weekend. I don’t even know why I kept going past it, especially as I love Quentin Tarantino and saw just about everything he’s made so far. I liked it, plenty of cool violence, classic revenge story which emulates old Japanese samurai movies. Very artsy too. Can’t wait to see part two.
You?