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I've never been hypnotised but from the movies I've seen, your likely not in control and seems to follow the directives of the one whom is doing the Hypnosis.
It's not just that hypnosis is rare, it's only supposed to work on a very small percentage of individuals. The basic idea is that you believe it will work, and therefore it does.
Lol... funny you would say that about the movies. I agree with you on the fictitious nature of movies but, you'll also agree with me that fiction or not, movies are some of the ways new tech or developments in our world are developed or imagined.
From the comment you've made above, I could deduct that, we establish the fact that hypnosis is by far real but, it works only when you get to believe. That's clear enough for me and hopeful it goes both ways.
Now the thing is, am not saying someone would just jump you or something although, I don't doubt it's possibility but,
Isn't it possible that some sick individual, needing therapy could subject himself to some therapy by hypnosis with a whole different intention at heart and then, without any suspicion during the process, the administrator digresses to fraud?
That's just one way I've chosen to think of it.