I've not cried watching films/tv shows but there are times when I've come close. Green Mile being one of them, and funnily enough Optimus Prime dieing in the Transformers Movie also makes me get a bit emotional, but then so does when Rodimus Prime arises at the end (happy emotional not crying emotional btw). I love that film......
I know there's another one that can do it as well but I can't think of it off the top of my head so unless someone else mentions it I won't remember, I think I tend to block out my wussy moments.