I'm not sure about pure evil so much as sociopathic. I worked briefly in door to door sales, got taken to some high performer award celebration nonsense and was standing in one of those group circles as people were recounting war stories. "Give her the discount? Hell no. And then I realized she was too old to read what I was writing so I just added an extra year on to the contract!" Huge round of laughter, light applause.

To make it more gross... The discount was standard, we got no extra commission for having or not having it, was purely a free promotion to grease the wheels. He just didn't because, well, the old lady he'd scammed was too trusting.

I quit shortly after.