This is based on opinion. Please don't list it on a work's trope example list.
Tear Jerker / American History X
The ending, so very much, where Danny is shot to death over a senseless spat with a black kid and his brother cradles his dead body.
The flashback, when Danny is remembering his father and wipes away tears as he finishes typing. This segues into a home video-style flashback where Derek and Danny are playing on the beach. This is even more dramatic in hindsight since the younger brother who seems to marvel at the world as a little kid dies in the end.
The look on Murray's face when he says "Derek, this is your family" after Derek escalated a heated discussion into a physical fight.