An old friend of mine who had been to prison on a couple of
occasions in his younger years asked me what I thought had been the
main things he'd learned from other people in jail. I naively
replied "How to be a better criminal."
My friend put me right: "You know what everyone in prison has in
common?" he asked. "They've all got caught! So the biggest lessons I
learned were the ways people get caught and how to avoid making the
same mistakes!"