Hypnosis

Hypnosis is the ability to allegedly control someone using the power of your mind. Hypnotists can apparently help people to block memories, regress to earlier lives, or wander around clucking like chickens.

In badfic, hypnosis is often used to compell characters to do things they wouldn't ordinarily do, such as rape, falling in love with someone inappropriate, or wandering around clucking like a chicken.