As a butcher is shooing a dog from his shop, he notices £10 and a note in his mouth, reading, "Ten lamb chops please." Amazed, he takes the money, puts a bag of chops in the dog's mouth and quickly closes up the shop. Greatly intrigued, he follows the dog and watches him wait for a green light, look both ways, then trot across the road to a bus stop. Then the dog checks the timetable and sits on the bench.
When a bus finally arrives, he trots round to the front and looks at the number, then boards the bus. The butcher follows, dumbstruck. As the bus travels out into the leafy suburbs the dog takes in the scenery until, after a while, he gets up and stands on his hind legs to push the "stop" bell, then gets off - closely followed by the butcher.
A couple of hundred yards down the road, 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. Shocked, the butcher runs up shouts at the guy, "What the hell are you doing? This dog's a genius!"
The owner responds, "Genius, my arse. That's the second time this week he's forgotten his key."