The water bailiff catches Tommy leaving the lake with a bucket of fish.

"Aha! I've caught you poachin' fish red-handed," says the bailiff.

"What do you mean, red-handed?" says Tommy.

"You've got a bucket full of 'em right there. You can't talk your way out of it this time."

"Oh, you don't understand," said Tommy, "I've not poached a thing. These are me pet fish. I bring 'em to the lake once a week for exercise. After they've had a good swim, they come back to the bucket and we go back home."

"Do ya expect me to believe such an outlandish tale?"

"I can prove it." says Tommy. So they walk back to the reservoir and Tommy dips the bucket in and the fish swim away. They stand in silence for 20, 30, 40 minutes - no sign of the fish coming back to the buckret.

"Ha, ya lying rogue!" shouts the bailiff. "Where are your fish?"

Tommy (he's not stupid) replied "What fish?"