Most every stall I've ever "utilized" has a toilet paper dispenser in it. I unholster, set my pistol ontop of it, do my business, buckle up, and reholster. I even have enough presence of mind not to reholster with the hand that utilizes the TP. I've never had a bathroom experience so intense that I forgot my pistol behind, but I guess it happens to some people.
I've carried concealed at shows. If they notice and ask me to leave, fine. I don't see it as anymore "idiotic" to carry at a gunshow than anywhere else. The "idiots" are the ones who are careless with their firearms.
Sigh. There's a Beavis and Butthead joke lurking somewhere in this story. I'm glad the guy is okay. ("I AM CORNHOLIO! I NEED TP FOR MY BUNGHOLE!" "DO YOU MOCK ME?" "Heh. Heh.")