Haven't seen any of those Hannibal movies... Red Dragon, whatever. Another vote for Scarface and Godfather. Dances with Wolves, Braveheart (only seen the beginning 100+ times), any of the Evil Dead movies (seen small parts of the movies here and there), Mallrats or "Clerks" or whatever that shit is called (I intentionally avoid this movie because the people who highly recommend this movie to me all the time also happen to ooze hypocrisy from every orifice of their body), and every other crappy movie that people think I should've seen but haven't.
The only movies you should be ashamed of for not having seen (that I know of) are:
Starship Troopers
Donnie Darko
Fifth Element
Fight Club
12 Monkeys
Life as A House
Star Wars series (granted they're not that great, but you just have to watch them)
Matrix, Matrix: Reloaded
I can already see the sorts of know-it-all, smart-alec comments that will be made based on the movies I listed here, and I don't really care, either. Have fun!