I cry sometimes when I put my contacts in or take them out. Not because I'm sad or because it is painful, but because my eyes think "what the **** are you doing!?!? NOOOOOOOO!!" and then they weep, probably out of fear of the foriegn objects obstructing their ocular lenses.
Sometimes I cry if someone makes me feel really sad, like if someone I care about and like spending time with and whom I really trust does something to hurt my feelings.
And every once in a while something in a movie or show might make me cry, like when Sam, the dog died in I Am Legend. Or the end of Final Fantasy X. They don't make me cry now, but they did the first time I saw them.