If you watch "Busted on the Job" you will see that even in 5 star restaurants, if its not the chef that does the unimaginable to your food Just watch what the people do to your food, who are serving it to you.
As far as walking bear footed in a restaurant bathroom, i wouldn't do that any more than i would walk bear footed out doors. I've seen people spit on the ground among other stuff.
