In the 1940s, in the New Mexico Desert, Feynman was bored while working on the Manhattan project that would birth the atomic bomb. Naturally, then, he decided to occupy himself by pulling pranks on his colleagues.
Knowing that most of them were relatively careless when dealing with the safes that stored top secret documents - whether forgetting to lock them, or leaving them on factory settings, or choosing obvious dates as their codes - he began leaving notes in the place of their work like:
"I borrowed document no. LA4312 - Feynman the safecracker."Eventually, he got so good at it that the Colonel in charge of his unit began advising people that if Feynman had been anywhere near their safe, it was a part of their job to change their combination lock once more.
This story is one of many stories Feynman tells in his autobiography Surely, You're Joking Mr. Feynman!, where his playful nature gets the better out of both him and his attention.
Comment: This is where the tools of gaining insight become invaluable: Getting to know how others see you can help you see yourself