Lol, I once worked in a small office - like 12 employees total, about half were guys, and some were usually out of the office traveling to client sites. So, it was really only 3 or 4 guys regularly using the mens bathroom. Well, one new guy got hired and consistently would drop bombs and not flush. It blew me away because its like, wtf are you thinking dude? Did he just assume everyone else does that as well, so it wouldn't be an issue? Or that we wouldn't all know it was him? It was clearly obvious he was the one doing it, because it had never been an issue until he showed up. Eventually one of the partners sent out an email to the men in the company basically detailing how incredibly disgusting and unprofessional it was, and it finally stopped, but I seriously don't understand how anyone can do that. Hell, if I blow up a toilet I stick around and do multiple flushes just to make sure there's no evidence left behind.