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.
Meh, there are plenty of people in the real world who just want power and money for themselves, who will shit on anybody and anything to get it and teach others to hate on people for just being different in order to gain power. I don’t think it’s at all implausible that absurdly nasty and selfish people exist.