I don't think you see them as often as you used to, but does anyone remember the hypnotist shows that people put on at colleges and bars? They are shows where a hypnotist puts volunteers into a hypnotic state and has them do things like bark like a dog, see flowers grow out of their bellybuttons, and other comical things.
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In watching a webcast from a church I formerly attended, it occurred to me that this was almost the same thing. The pastor will say a few magic words and on cue someone will start quivering and giggling. Is speaking in tongues and getting slain in the spirit just another form of hypnotism?