Persistency Act

A guy hears a knocking on his door. He opens it up, and noone is there. He looks all around and he finally sees alittle snail sitting on the doormat. He picks it up andthrows it across the street into a field.Ten years go by, and one day he hears a knocking on hisdoor. He opens it up and no one is there.He looks all around, and he finally sees a little snailsitting on the doormat.The snail looks up and says, „What the hell was that allabout?“