In 2000, a married man had a tumor the size of an egg growing in his brain, pressing on his prefrontal cortex. He suddenly developed a severe pornography addiction and pedophilic thoughts accompanied by excruciating headaches.
When people are being watched, they behave better. And the illusion of being watched works, too. It was enough to hang a picture of human eyes in a self-service cafeteria, so that more people began to collect their dishes.