As a professor, I have been a part of many discussions regarding campus security and active shooters. I just read this article about a problem related to gun ownership that I hadn't realized was happening, though: An Alarming Number of Guns Are Waiting to Be Found in Campus Restrooms
I have returned a couple cell phones that have been forgotten atop toilet tanks to their owners. I myself accidentally left a plane ticket in an airport restroom stall and had to run back to get it around six minutes later when I discovered it was missing. It makes complete sense to me that people forget their loaded guns as well, particularly because they aren't a frequently-used accessory. I have no doubt that if the number of guns on campus increase, the number of accidentally abandoned, loaded guns will also increase.