Itchy and Scratchy: Bash to the Future

"Itchy & Scratchy: Bash to the Future" is an episode of The Itchy & Scratchy Show, which is featured in Bart Simpson's Joke Book.

Plot
Itchy hits Scratchy in the head with a bowling ball. Scratchy then builds a time machine and travels back in time to save himself from the bowling ball. But before Scratchy has a chance to save his past self, he is hit with a bowling ball in the head by Itchy, who has also gone back in time.