A policeman is walking near a lake.. He noticed a man with a bucket full of fish. No one is allowed to fish in that lake unless you have a license so the police goes up to him and says ""May I see your fishing licence please? If you don't have one then I'm afraid I have to give you a ticket of $500"" The fisherman responds with ""Oh I don't have any licence. You only need the licence for fishing, but I'm here to let my fish swim. You see, I let my fish swim 45 minutes a day and then when I whistle they come back and I take them home."" The policeman starts laughing and says ""Do they come back when you whistle? I don't believe you!"" ""I can prove it to you!"" Says the fisherman ""Go ahead"" Says the policeman while still laughing The fisherman released the fish into the water. They wait a couple of minutes. Finally the police man gets annoyed and asks ""When are you gonna whistle so the fish can come back?"" The fisherman looks at him in confusion and says ""Fish? What are you talking about?""