Ranma ½, part 8 number 13

Part 25: Back to the Freak-ture!: The family is discussing how Happosai gave Pantyhose Taro his name. Taro is there also. Ranma changes into Ranma-chan to lure Happosai out from whereever he is. Ranma sets up a play, sort of, to trick Happosai into changing Taro's name.

Shampoo has some hypnotic incense to make Happosai think he's gone back into the past when he gave Taro his name and get him to name Taro something else. The idea doesn't work and Happosai thinks he needs to destroy Taro to save all the pantyhose of the world.

Part 26: And back and back and back...: Ranma fights Happosai and breaks him out of the hypnotic trance. Happosai claims he'll change Taro's name but he doesn't.