@vnewman2- Ugh...I am trying to figure out whether to thank you for bringing up a good example or yell at you for grossing me out. :)
I've decided to thank you for reviving "grody to the max." God bless the 80's.
One really questions once you bring this up, why a respectable company or doctor would feel a need to lock the visitor's bathroom to begin with. What do they think we're going to do in there that we wouldn't do after asking for the key?
Keys in general are probably among the dirtiest things we interact with. Like money they are something we touch with our hand and never get cleaned. And in certain settings they are touched by multiple people. The only thing that is vaguely saving them is that they problem aren't a great envirnment for germs to live on long term. They probably don't get much food for the germs and because they are metal, they have variable temperatures. That said, I think I'm going to go throw my keys in the dishwasher. :)