In 1975 I was attending college on a small Alaska campus.  A student from Connecticut was attending a room party, and waving around his newly purchase S&W .44 magnum, "the most powerful handgun in the world". This was of course at the height of popularity of the Dirty Harry movies.  Waving this gun around at the party, he made the other students, all Alaskan, rather uncomfortable.  So to show how safe his shooter was, he pointed it at the ceiling and pulled the trigger.  And blew a hole in the roof of the dorm.