One day, a man is sitting at home, watching TV when he hears a small knock at his front door. He goes to the door and opens it, looking around to see who knocked on the door. The man looks down at his feet and sees a snail on the porch. He picks up the snail and throws it as far as he can.

Three years later – the man hears a small knock at his front door once again. He opens the door and looks down to see the very same snail. It looks up at him and says, “So what was that all about??”