One day, a man was walking down the street when he saw a boy, jumping up and down on a manhole cover and saying "27, 27, 27..." over and over again. The man asked the boy, "Why are you jumping up and down on a manhole cover, saying '27' over and over again?" The boy replied, "Well, I just think it's kind of fun. You should try it." In spite of himself, the man switched places with the boy and started jumping up and down on the manhole cover. While the man was preoccupied, the boy pulled the manhole cover out from under the man, and he fell in. The boy smiled, put the manhole cover back, and started jumping on it again, saying, "28, 28, 28..."
