-“NOOOOOOOOOOOOOOOOOOOOOOOOOO!!!” or varient thereof.
After seeing Darth Vader do that in ROTS, it’s offically jumped the shark and thusly should only be used in a tounge-in-cheek manner from here on.
-Fuel barrels that explode when shot by bullets, or lit on fire. Hell, Fuel barrels that explode, period. Fuel doesn’t explode. If it did, nothing would be safe to drive.
-People racking the slides on their guns gratusilously. People, you only need to do this when the gun jams, or when you’re reloading. Doing it over and over may look cool, but to people who know squat about guns, it just shows the gun is actually empty, or the characters are ejecting perfectly good ammo.
-Huge, Clean sewers or air vents. In real life, maintence tunnels are rarely that big and very rarely clean. And they are almost never easy to access.
-Idiot “elite” combat teams who die very quickly when put into real combat.
-Crappy Romantic Dialouge. “Promise me that you will never die” moments in many movies. It’s amazing how often this pops up.
-Amazingly crappy dialouge, period. Whenever something is to be said, the writer should ask himself “Would someone actually say this in real life?”. If no, rewrite it.
allowances can be made for genre but the rule still stands.