I love to watch sad movies when I'm down. They always make me cry and that's just a great way to relieve the stress and process everything. I usually watch 'Moulin Rouge' when I feel like that. Sometimes I like to watch happy movies too but that only makes me forget for a little while...they don't really make it better
But then again...I love sad movies in general 'My sister's keeper' is great! I was a mess when I watched it in the cinema...