The Hypnosis Technique (催眠の術 Saimin no Jutsu, lit. "Art of Hypnosis") is used to hypnotize and control the mind of the target.
The technique is used by Baba's brother Master Roshi (disguised as Jackie Chun) when he fought Man-Wolf in the 22nd World Martial Arts Tournament. Man-Wolf could not turn back to a human because Roshi destroyed the moon with a MAX Power Kamehameha to return Great Ape Goku to normal during the 21st World Martial Arts Tournament. Master Roshi uses the Hypnosis Technique on Man-Wolf to convince him that Krillin's head is the moon. The Hypnosis Technique works and Man-Wolf turns back to a human. Master Roshi's Sleepy Boy Technique is a variation that utilizes hypnosis to put the target to sleep, which he utilizes against Goku in the 21st World Tournament .
In Dragon Ball GT, Hell Fighter 17 uses this technique to brainwash Android 17, who himself briefly uses it on Android 18 before fusing with Hell Fighter 17. The Para Brothers have their own version of this technique which takes the form of a hypnotic dance that forces a target to dance along with the user.
Appearances in games
In the video game Dragon Ball: Revenge of King Piccolo, General Blue uses hypnosis to brainwash Octopapa and makes him take part at his battle against Goku. In Dragon Ball Z: Harukanaru Densetsu, King Kai uses this technique to oblige Vegeta to tell him jokes.