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Unsung
Since: Jun, 2016
31st Mar, 2021 05:45:08 AM
I don't know that we have a trope for picking a volunteer from the audience more specific than Audience Participation, though that does happen in real life, often with close-up magicians and hypnotists. We do have Hypno Fool and More Hypnotizable Than He Thinks, which could be related, and Ignored Raised Hand for when it's a "volunteer" (a prearranged plant).
Edited by Unsung
Fictional show magicians tend to pick audience members as "assistants".