When I was a kid the circus would come to town every year. One attraction was a freak show. They used to bring out a couple of acts to get people to pay to come into the tent and see more.
One was a guy that could pop his eyes out. Not just out but also popping in and out repeatedly.
Similar to this.
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Another act was a guy that would turn into a gorilla, in the end he would break out of the cage wearing a gorilla suit and run around the stage. A whip would come out to tame him back into the cage. It was well done.
Been to hypnosis shows, quite entertaining. My friend volunteered and made a fool of himself.