Joke: Once there were three friends, None, Someone, and Mad. One day they went to a park and suddenly None started fighting with Someone. Mad didn't know what to do so he called the near security guard. He said, "Security, None is fighting with Someone! ".The security look t him surprisingly and said, "Are you mad?". Then Mad said, "Yes, I am Mad." Then the security took Mad to the police station and None and Someone kept fighting.