bad bad joke (snail)

A man hears a knock on his door.
He goes to open the door, but doesn’t see anybody.
As he looks down, he sees a snail on his door step.
He kicks the snail across the street, closes the door, and goes back to his living room.

Two months later, he again hears a knock on his door.
As he opens the door and looks down, there is the snail again.
Before he has the chance to kick it again though, the snail yells at him: “Hey – what was that?”