Any and every movie that has to do with an animal. I bawl at the end of Homeward Bound, starting with Shadow falling into the hole and then really sobbing when they're calling for him and he finally staggers over the hill to Peter. OMG, I'm tearing up now just thinking about it.
Marley and Me. I bawl.
Old Yeller, 'nough said.
The end of the The Time Traveler's Wife.
The episode in LOST (season finale for season...five, I think), when Juliette falls down the shaft and Sawyer is holding on to her desperately, but then finally looses his grip and she plummets. When Sawyer looses it I loose it.
Doctor Who, the Doomsday episode. I also cried in "The Doctor's Daughter", at the end when she takes the bullet for him.
The Lion King, when Mufasa dies.
When Sam dies in I am Legend.
Wolf's Rain
killed me. I cried when Blue and Pops were reunited again and when Toboe died.
I also cried at the end of the Code Geass series, when Nunally is holding Lelouch realizing, remembering, and he passes on with the crowd chanting for "Zero".
For me characters dying doesn't get me, it's someone's reaction, especially if they are talking about it/talking to the dying person and their voice cracks and they start to cry.
This for me, too. It isn't really people dying, but the sheer emotion behind something.