In 1986, while attending CalArts, future Simpsons director Jim Reardon directed and animated the B&W cult classic, Bring Me the Head of Charlie Brown. The film had a rough look to it, but it the parody is well executed and the seeing the Peanuts being this violent is both memorable and jarring. In the short, the Great Pumpkin puts a price on Good Ol’ Charlie Brown’s head and all of his friend try to collect. Finally at the end of his rope, Chuck snaps and goes on a killing spree. The thing then devolves into a bizarre violence montage.
It is not for everyone, but an interesting bit of cult film history.