So, in an attempt to put him out of his misery, I rang North Wales Police the other day.
"I was just wondering," I said, "whether you know that we have an empty police car in our road which has been there for three weeks and doesn't seem to have moved in that time."
"Ah," said the voice at the other end of the phone, "Well, I don't personally know about it but I'm sure there is someone who does. It's bound to be there for a reason."
He didn't sound too sure, though.
"I'll look into it," he said. "Can I have your name, address and telephone number, please?"
Ooh, I thought, he's going to get back to me and tell me what's going on.
But he didn't.
The car is still there and now there is no way Keith can open it and turn it round as they have all our details.
They probably wouldn't think it was very funny anyway.