A man hears a knock at his front door.
When he opens the door, he doesn’t see anyone at first, but as he’s about to close the door, he sees a snail sitting on the doormat. The man picks up the snail and throws it as hard and as far as he can, then goes back inside. Five years later, the same man hears a knock on his front door. He opens the door, there’s the snail. The snail says, “What the hell?”