A man get 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 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 in the lake)
Warden: well this I got to see!!
5 minutes later...
Warden: well??
Man: what?
Warden: the fish!! Where's your pet fish??
Man: what fish??