I cry in all sad films, the most pathetic one was when Dobby died in HP7 part 1, lol. It's not as bad as my other friends, we were watching titanic and a few of them cried just at the music and through the whole film!
Star Wars Ep III, when the Jedi are betrayed.
300, the final fight scene when the spartans fight it out to the death
American History X, the ending.
Jack (Robin Williams), very emotional towards the end when he comes to terms with his accelerated death.
The Iron Giant (!)
The Lion King
Closest I've ever got was at the end of Toy Story 3. Determined not to cry, I held it in until the film was over. Got to the toilets to find there were several blokes wiping tears from their eyes. Was kinda funny.