Don't even THINK about suggesting a game of Monopoly. This rule may not be in any of the royal history books, but apparently the family is forbidden from playing Monopoly — and the reason will make you laugh. During an official appearance before Christmas 2008, Prince Andrew was presented with the classic board game and revealed, "We're not allowed to play Monopoly at home. It gets too vicious." There have been lots of stories of how crazy things get during the queen's annual Christmas festivities at Sandringham, and Monopoly must have became too competitive to handle. Image Source: Getty / Justin Sullivan