scenes rather than a whole movie for me. one that springs to mind is at the end of seven pounds when rosario dawson meets woody harrelson, and he susses out who she is - man I was a wreck lol. Her seeing the good will smith did, woody realising how emotional she must have been - I thought everyone could really get into the mind of fictional characters and place themselves in those moments, and feel their feelings. Turns out not everyone can (and is far less common than I used to think it was), so I actually get choked up at a lot of stuff most people don't, it seems.
Good because I can really get into a film, shit when your teenage daughter takes the piss (or thinks you are putting it on lol)
I fucking cried at some part of the cartoon movie Tarzan ffs, and it wasn't even that sad a part
edited to add:
I just realised right after I posted, the 'sad' things I'm not too bad with, it's the happy but very emotive things that seem to get me the most. So that scene from seven pounds is actually a happy one rather than a sad one. Fucked if I can remember the tarzan one though.