I was watching a Stage Hypnosis Show and saw a the Hypnotist, can't remember who it was but he made a female on the show first quack like a duck, the cluck like a chicken, then bark like a dog, he put her under a post-hypnotic suggestion each time to have her does these things. She then looked shocked when he brought her out of a trance and told her what she did, my question was how can a hypnotist make a person do that, and why is the hypnotized person doing it.

Wow, you have asked a LOT in one question.

the answers are quite long, have 2 varried opinions, each supported by evidence and science, and the only thing everyone agrees on is that nobody agrees!

I personally am not going to jump into the fray here, but good luck finding an answer.