Kids carry around ammo cans all the time, even to school. Nothing kills the romantic mood like a coffin in your dining room. Nice people don't hide veteran's artificial legs. Stilts are pretty handy for peeping toms. Getting spray painted sucks.
Every school has a hatchet or two hanging around.
Never let an antisocial teenager sing the National Anthem. Unamplified country music can muffle a gunshot. Replica cannons are fully functional and deadly accurate. This must be the longest and most violent sack race in the history of the world. Still, it is the movie's real saving grace.