You cannot be hypnotized to do anything you wouldn't normally do in your conscious state.
The rules that govern your life are held in your subconscious mind.
If, under hypnosis you are asked to do something that goes against those rules, you essentially wake up.
If you've ever been to a hypnosis show in Las Vegas, you'll see this phenomena.
The hypnotist may suggest the volunteers do something like dance to song in a very flamboyant fashion.
If some of the volunteers are very uncomfortable dancing in front of people, they will snap out of hypnosis and wake up.