Mine have to be, in no particular order:
Lord of the Rings (All three of them, I know the entire monologue done by Galadriel in the beginning of the first movie :P )
Underworld (Only the first one, Evolution wasn't as good as it should've been, and I have yet to see Rise of the Lycans)
Shaun of the Dead (The best comedy ever I Simon Pegg, he's amazing)
Star Trek (Lord, the cast was perfect. Chekov had the most adorable, yet bad, accent. Spock was just epic, Sylar = Spock, anyone? xD And then we have Simon Pegg as Scotty, can you get any more perfect?)
The Dark Knight (One of the best films ever, I still wonder if Christian Bale is as much of a jerk as he seems. :/)
What are yours?