A man hears a knock at his door, opens it but doesn’t see anyone.
He glances down, sees a snail there and being the conscientious gardener he is, tosses the snail across the road, into a field, away from his property.
Ten years go by, and one day the man hears a knock at the door, but once again, doesn’t find anyone there when he answers.
He looks down, sees a snail there.
The snail looks up at him, and in a tiny voice demands, –
“WHAT WAS THAT FOR?”