I agree with almost everything Dylan P says above, apart from his views on the watch waving thing.
Doing something like waving a watch in front of someone's eyes can be an aid to inducing trance for two reasons. Firstly, it makes their eyes tired, so when you give a "sleep" suggestion, they can already feel the fatigue happening and it confirms for them that something real is going on. Secondly, it makes them focus, and focussing on a moving object takes some mental effort, which distracts their logical mind and makes them more susceptible to suggestion. I would also suggest that in 2008, bringing out a pocket watch and swinging it in front of someone's eyes adds a couple of extra layers of suggestion, in that a lot of people are pre-conditioned that this can be used in hypnosis, so they are already mentally prepared for something to happen, and also that a pocket watch is a very unusual object these days, which will increase their interest in it and therefore their focus on it.
In addition, I've been thinking recently about whether it's possible to make someone do something which is against their value or belief system. I've concluded that yes, it probably is. You'd need to convince the person that what they're about to do isn't real, that it's just part of a performance, maybe some kind of hidden camera show, and I think you could make people do pretty much anything apart from self-harm or suicide. If you convinced someone under hypnosis that the gun they held isn't real, and they were just about to take part in a hoax for TV, it was only loaded with blanks and shooting that guy who was made up to look like the President would lead to fame and fortune for them as a TV performer, I think it could be made to happen.
Is it unethical to say that? Of course I in no way condone doing that, I just mention it as a point for discussion because it's a very common view that such things are impossible.