Sleepers
http://imdb.com/title/tt0117665/
Plot Outline: After a prank goes disastrously wrong, a group of boys are sent to a detention center where they are brutalized; 10 years later, they get their chance for revenge.
I really liked the ending, cuz the two guys in did what we all would want to do too, makes you feel good
plus, kevin bacon gets head from one the little boys rock: