How and why does arm-pull induction possibly work?

Sorry for the bluntness, I'm new to this subreddit, so please try and bear with me. I'm EXTREMELY open minded when it comes to a lot of things, and I've always been interested in learning hypnosis, but every time I even do the slightest bit of prying into beginner's stuff, I just get to one of the instant-induction techniques being talked about simply and easily and I just can't take it at face value like that.... why does this supposedly work? They even demonstrated it on MythBusters, but I'm only ever able to find maddeningly simple "explainations" about it being a "shock to the system" coming from somebody "with total confidence", which isn't nearly a big enough variable for something that incredible.

I don't know anybody to try it on me(I'm near-positive I can't be hypnotized) and there's no way I can just do it to somebody else.... it feels like this is just some massive prank, or easily-debunkable Mentalist stuff, but it's proven by science. Does anybody else feel this way? Any hypnotists here felt it and overcome it? Please.... this drives me mad.