Zen and the art of washroom maintenance

I went to CP today and was struck by a notice outside Zen a Chinese food restaurant.



What would they do if someone did use the washroom without being a restaurant guest? They might have Robots in the restaurant loo. A restaurant guest is given a special loo pass. They must present it to the Robot guard. If the person is a trespasser, he might have to go through the following:

First offfence: Firmly pushed out
Second offence: Booted out (Robots are made of metal. Might hurt like bloody hell!)
Third offence: Castration (So if you see a guy clutching his crotch in the CP area, don't eat the Eel at Zen)

PS: I dislike Chinese food immensely so I haven't been to Zen. But I'm quite sure the Robot story is a figment of my imagination. They have a burly mustache wearing guard outside and he's scary enough. But wouldn't the Robot guards have been cool?