I don’t know whether the tradition continues, but when I was a young boy in the 1950s, growing up in Moortown, November 4th was Mischief Night. We went out and committed minor acts of vandalism. One aim was to collect wood for the following night’s bonfire. I regret to say that it was not just broken branches and discarded timber that we took. Wooden gates and other burnable objects were not safe if they could be removed easily. One year my anti-social behaviour took the form of removing the numbers that people fix to their doors and gates to indicate their house numbers. A week or so later I noticed that some of the old numbers which I had removed with some difficulty had been replaced by shiny new numbers with new screws that were much easier to remove. I couldn’t resist the temptation. Soon I had quite a large collection of new numbers. Fortunately I came to my senses before I was caught, and stopped carrying a screwdriver. To hide my crime I buried my horde of numbers in a tin box in the back garden. I wonder if they were ever found. I hasten to add that in the seventy years or so since then I have gone straight. However my interest in numbers has continued, and, after a career teaching mathematics, in old age I still get pleasure devising and solving numerical problems.