A man gets stopped by a game warden with his basket full of fish.
Warden: do you have a permit for all these fish?
Man: no sir. These are all my pet fish
Warden: your pet fish? How’s that?
Man: well, every night I take all my pet fish for a walk to the lake, I let them swim for about a half hour, and then I whistle and they all come back and jump in my basket and we go home. We do this every night.
Warden: well that’s just a crock of lies!!
Man: here, I’ll show you… (releases the fish into the lake).