Damn. I can't even begin to count how many times I couldn't sleep at night because of this. Once I was reading a book at 1 am in my bed, so I decided to spoil the ending (big mistake) and ended up getting boogies all over my book.
God, if I could list all the things I've cried at...
Drake's Fortune 3, Water for Elephants, Ted, Hunger Games (the book not the movie), Paranorman, Marley and me, at my own stories, What the Night Knows, Titanic (although I hate the movie), West Side Story (terrible acting but still sad), Dumbo, the music video for My Chemical Romance's Never Coming Home, Boy in Stripped Pajamas. When I was eight I cried at the Spongebob Movie.
I get VERY attached to fictional characters. That's only the times I can remember right off of the bat.