I ran a weekly trivia challenge when I was in high school. I'd offer up an obscure question, and the first to answer it won a free pizza. The one question that

I ran a weekly trivia challenge when I was in high school. I'd offer up an obscure question, and the first to answer it won a free pizza. The one question that remained unanswered at the end of the year was, "what happened on September 10th, 1752 in Britain?" At the end of the year, I revealed the answer to that one question that had remained unanswered. Nothing had happened that day, as it didn't exist. Afterwards I had to explain the transition to from a Julian calendar to a Gregorian one to a very miffed group of trivia players.