A boy is found fishing in a nature preserve by a police officer. His bucket is full of fish.
Cop: Do you have your fishing permit on you young man?
Boy: no sir. they’re my fish. I brought them from home.
Cop: What do you mean brought them from home?
Boy: Every day I come here and let the fish swim in the pond and then I call them back.
Cop: What? How?
Boy: I whistle at them and they jump back into the bucket.
Cop: Show me.
At this point, the boy empties his bucket and stands still.
Boy: So what?
Cop: Call the fish!!
Boy: What fish?