Not sure if I ever posted this one, but it just came to mind as I was taking security training. If you remember the answer, wait and spoil it later... > > If there is 30 people in the same room, what is the probability that any two individuals have the same birthday? > > This question underlines the slippery nature of probability, and the importance of asking the right question. > > The answer to this is available, however I hope you try this on your own before going to google/Bing/Baidu...-I would guess 1 in 24