My basis for "not believing" in "you are under my command", "you will forget this happening"-style hypnosis is that it isn't proven in any scientific way. My recalling my stage hypnotism experience was to answer your point that "I'd never been hypnotised" while also explaining a possible way that the effect might work, if there is no such power; which is the default position; if there is some power, we need to test it and prove it.
Yeah, I have heard about this before. It's interesting.
What does it have to do with doing things against your will and having no memory of them?