Mean Creek

When Sam (Culkin) continually gets picked on by the school bully, he and his protective older brother decide to teach the bully a lesson he will never forget. Together, they come up with a plan that involves inviting the bully on a special river trip for his birthday where they will make sure he is humiliated for all to see. Deciding that he no longer wants to go through with the plan, Sam tries to call it off but it's too late and he must live with the resulting consequences. (official distributor synopsis)