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[–] 14521980? ago  (edited ago)

If you read the fucking wikipedia link I gave, it explains what the human microphone is:

A human microphone, also known as the people's microphone, is a means for delivering a speech to a large group of people, wherein persons gathered around the speaker repeat what the speaker says, thus "amplifying" the voice of the speaker without the need for amplification equipment.

It has NOTHING to do with hypnosis. OP made that part up by themselves.

The simplest explanation is usually the correct one.