The Battle of Shaker Heights (2003)

A young war reenactor makes a friend on the battlefield who helps him use strategy to take on his high school enemy. Driven by newfound confidence, he seduces the friend's fetching older sister and risks the friendship. Reality intervenes when the illness of his ex-addict father forces the anger his irony masks to the surface and he has to decide if staying in a fantasy world is worth the consequences.