Once in college a friend's friend was showing off a Springfield. He drew it from a zipper bag and was jokingly, casually pointing it at me and other onlookers. It was unloaded and he stated that but I was terrified and thought much less of the guy ever since.
Whenever I show a gun to someone, I keep it pointed well away from people. Action open, no magazine, and I touch the chamber. Then when I hand it to someone I explain why I did that and ask them to do the same as a double-check and to make them comfortable.
Maybe that one time educated me on how to make others around me more comfortable handling my and their guns.
Shoot smart. Shoot S-Mart.