Driving through Dallas, I was following a truck in fairly heavy traffic.
Every block or so, when we were stopped at a stop light, the driver of the truck would jump out of the cab with a big stick and bang on the side of the cargo bay. Then he’d jump back into the cab in time to drive away when the signal changed.
I watched this go on for a few miles, but finally I had to ask. The next time the truck driver jumped out with the stick, I jumped out and ran up to him.
“I’m sorry to bother you,” I said, over the din of the banging, “but I’m very curious; what you are doing?”
Without breaking rhythm, the truck driver replied, “Sure. Y’see, this here’s a six-ton truck but I’ve got eight tons of canaries aboard, so I’ve gotta keep two ton of them flying all the time so I don’t break an axle.”