I’ll go first. Mine is the instant knockout drug. Like Dexter’s intramuscular injection that causes someone to immediately lose consciousness. Or in the movie Split where there’s the aerosol spray in your face that makes you instantly unconscious. Or pretty much any time someone uses chloroform.
I’m pretty tired of the sanctity of life trope. Especially when the hero kills a thousand henchmen to get to the villain, and then all of the sudden decides it would be wrong to kill a guy who is trying to destroy the world or whatever.
Also the hostage trope where they point a gun at someone and say “drop your gun” and the hero does so. How fucking stupid are you? Just shoot the guy in the face.
Also major injuries that take a year to recover from, but somehow Mr. Average guy is running around and fighting 2 minutes later.