In Tokyo, "The Restaurant of Order Mistakes" opened for a trial period last summer. It hired people with dementia as waiters, and told customers they might get orders wrong.
Customers seemed to enjoy never knowing what they were going to get.
Karma comes after everyone eventually. You can't get away with screwing people over your whole life, I don't care who you are. What goes around comes around. That's how it works. Sooner or later the universe will serve you the revenge that you deserve.