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 Real Life hypnosis is merely a state of extreme suggestibility, not mind control, and someone who is hypnotised is unlikely to do anything they would refuse to do when awake. Stage hypnosis where people are made to cluck like chickens works on the principle that the volunteer expected to be told to do something silly on stage and was willing to gone along with it in the first place.

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. In some canons allowances can be made, as hypnosis tends to be presented as much more powerful than it really is in published fiction as well - for example, Redwall's Ublaz Mad Eyes is able to compell a follower who knew too much to throw himself out of an upper-floor window.