The Battle of Shaker Heights (2003)

A quirky teen with a penchant for war reenactments, Kelly Ernswiler obsesses over military tactics with his buddy Bart. The school bully is one of Kelly's regular headaches, and he also has to deal with a frustrating situation at home, where his father is a recovering drug addict. Kelly's life gets even more complicated when he falls for Tabby, Bart's pretty and soon-to-be-wed older sister.