Although I’ve never known a cannibalistic serial killer (that I know of) I have met a few people who have potential!
It seems that some people try so hard to prove their worth but never really feel worthy meaning you can easily deeply offend them with a lighthearted quip. A flippant comment made in jest can deeply wound and in silence they wait in the shadows to get their revenge much much later when you least expect it. Revenge can take many forms from dagger eyes, slanderous lies all the way up the psycho chain to violence and shallow frying.
While this is clearly based on Dr. Hannibal Lecter from the 1991 movie The Silence of the Lambs there are real nut jobs like him in the real world. It’s scary to think that they walk among us so just be careful who you put down or pick a fight with… you don’t want to end up on their dinner plate.