So I've been thinking on this pehaps more than I shoud have bothered, (it's not knowing about the reason for the shocked reaction really ) but it's been a rainy week nailing tiles on and I've had the time. Even had a chat with MrsVM about it. But It's obviously not about a law of averages nor is it a probability puzzle, we considered chaos theory, but in the end we went for dunno. So what is it, the doing something a million times incorrectly but inadvertantly doing it right one time?