What's your pet peeve when it comes to tropes? What bothers you when you see it in a show or a movie?
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.
Guns don't blow the user backwards, unless it's a truly monster rifle fired from a standing position, and they certainly don't blow the bullet recipient backwards. The first cowboy movies showed people dropping straight down when shot and audiences thought that unrealistic. Yes, that's realistic and, I think, far more horrifying seeing someone's strings cut. There's a finality that showcases how deadly guns can be.
Rattly guns. Jesus. Guns don't rattle you Nimrods. They might make tiny sounds here and there, but Hollywood guns sound like they left out some screws or pins after assembly. I have a Colt .45, a somewhat loosey-goosey design, can't hardly get a sound even shaking the shit out of it. You can punt about any modern gun and not hear metal on metal.
Constantly cocking, racking, charging. Look! Here's our super badass who's been in danger the last 20-minutes, and he's just now chambering a round?! Or, Mr. Badass has to charge his weapon, kicking out a perfectly good round, to show he means business! And if it didn't eject an unspent round? Action hero was running around with an unloaded weapon. What's funny is that a real badass would fire all but the last round and then swap magazines. No charging required! Yes, that's way harder than it sounds.
Once the silencer is on nobody can hear the gunshot or the supersonic bullet or impact on a wall or the bloody wound. That John Wick scene was particularly bad.