I Guess Many Of Us Do Not Feel Comfortable,

using a toilet in say a restaurant or public place,

if that is the case here is one to be really wary of, it is in the Café Diglas in Vienna, Austria, using I guess smart glass as you enter the cubicle and lock it, the glass becomes opaque and a red and white no entry sign appears, I am guessing that the change is somehow electrical which makes me wonder how you would feel if you were sitting there and the electric went out, the glass the door is made of becomes clear, then to make your embarrassment even worse when the emergency lights come on there is not a supply wired into the cubicle door?