A man is sitting at home…

when he hears a knock at his door. He opens the door and there’s no one there- cranes his neck to look and see if anyone is hiding he looks left and right- nothing.
As he’s about to close the door- he looks down and sees a snail. He shrugs his shoulders and flicks the snail across his yard.
2 years go by
The same man is at home and there’s a knock at the door.
He opens the door and a snail says, “ Hey! Whatcha do that for?”