In addition to it being a fake movie trope, in real life, a sufficient dose of anesthetic to quickly and reliably knock a person out administered outside a controlled medical setting has a good chance of killing them. One of the only times “knockout gas” was used in real life was in 2002 when Chechen terrorists took 850 people hostage in theater in Moscow. The gas Russian authorities used to knock out the hostage takers killed almost 100 of the hostages.
Sidenote: knocking a person unconscious by hitting them with a blunt object is real, but it is also dangerous and causes a major concussion at best, and serious brain damage or even a delayed death from internal bleeding at worst.
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