What is a relatively minor trope that is in way more movies than it should be that just bugs the crap out of you?

For me it is knowing that the driver/pilot AND copilot of any vehicle will get killed when the antagonist and protagonist are in a vehicle together. No pilot ever uses autopilot either so the plane just goes into an instant death spin immediately afterwards.

Zombies, aliens, kaiju, regular humans (like ghostface), super humans (like Freddie or Jason) demons, vampires, ghosts, or something else I haven't mentioned. What's your favorite type of villian for horror movies?

I've always been partial to zombies, as I think they're the perfect mix of horrifying and unstoppable yet benign enough to not make the main characters feel hopelessly unable to do anything. I guess I find the idea that given the right choices I can make it out alive more interesting than the idea of a ghost/demon where you're just entirely at the mercy of magical powers that you can't do anything against.

But maybe that feeling of complete powerlessness is what some people are looking for in a horror movie.