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Chloroform is a "clean" takedown for henchmen. It allows the hero to be non-lethal. In Austin Powers (1997), the trope is parodied when an entire lounge full of people is knocked out instantly—acknowledging the absurdity.
: In movies, it takes seconds. In reality, it requires two to five minutes of continuous, deep inhalation to induce unconsciousness. xxx cloroform