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.
Van Helsing did the mirror thing which was cool. I think Dracula Dead and Loving It did too.
Side thought. I loved in From Dusk Til Dawn when they’re trying to think of all the folklore that they could remember. Like whether silver was supposed to hurt vampires too or just werewolves.
Another side thought, I love when they know about the monsters like in Shaun of the Dead. It always bothers me when it’s an alternate universe that’s never heard of Zombies before.