As a butcher is shooing a dog from his shop, he sees £10 and a note in his mouth, reading: "5 lamb chops, please."
Amazed, he takes the money, puts a bag of chops in the dog's mouth, and quickly closes the shop.
He follows the dog and watches him wait for a green light, look both ways and trot across the road to a bus-stop.
The dog checks the timetable and sits on the bench. When a bus arrives, he walks around to the front and looks at the number, then boards the bus.
The butcher follows, dumbstruck.
After a while he stands on his back paws to push the "stop" bell, then the butcher follows him off the bus.
The dog runs up to a house and drops his bag on the step. He goes back down the path, takes a big run and throws himself -Whap!- against the door. He does this again and again.
No answer. So he jumps on a wall, walks around the garden, beats his head against a window, jumps off and waits at the front door.
A big guy opens it and starts cursing and shouting at the dog.
The butcher runs up screams at the guy:
"What the hell are you doing? This dog's a genius!"
The owner responds,
"Genius, my backside. It's the second time this week he's forgotten his key!"