One day a man was sitting in his office on the 19th floor of a building. A man came running into his office and shouted, John, your daughter, Anna, just died in an accident right opposite this building" The gentleman was in panic. Not knowing what to do, he jumped out through his office window. While coming down, when he was near the 14th floor he remembered he didn't have a daughter named Anna. When he was near the 7th floor, he remembered he was not married yet. When he was about to hit the ground he remembered he was not John.