Thought of another one- 12 and Holding. Oh, boy. Hard to describe- but any movie that involves kids dying (not a spoiler- the plot involves the accidental death of a pre-teen and his twin brother's desire for revenge) is going to be a tearjerker. And the original ending was even more grim than what they went with.
One bright spot- naked Jeremy Renner in the shower- but he's having an emotional breakdown so it's hardly sexy.