Pulling up to the M6 Toll Plaza (as they insist on calling it) on Wednesday, I spotted a car in another lane trying to move into mine, so I let it in.
Without even a wave of thanks, the driver pulled up to the barrier, leant out of the window, and threw his four pound coins at the collection bucket. Miraculously, every single coin missed its intended target and rolled underneath his car.
"Congratulations, you missed the side of the barn," I muttered to myself.
By now, there was a queue of cars behind me, so I couldn't reverse. So I sat and watched as the man got out of his car, had a chat with one of the unhelpful barrier attendants, then started groping around under his car to retrieve the coins. Having rescued three of them, he had to get back into his car and, through a series of about 20 backwards and forwards manoeuvres, slowly work it sideways until he could reach the fourth coin. Then he was off in a rage of smoke. Hooray!
Needless to say, I took extra-special care dropping my coins into the bucket.
See also: No good deed ever goes unpunished