Stupidity: When a known killer (someone in the show or movie that we've seen kill someone on purpose with no regards, or someone we're told already has) finds or catches the main character (s), he or she decides to tie them up or kidnap them instead of just killing them. Leaving the main character (s) alive only serves the plot to allow them to escape or otherwise result in their being rescued and results in the killer being arrested or even killed.
Common movie and TV mistakes
This is a list of mistakes, things done wrong, etc. that happen so frequently onscreen we barely notice any more. 'Movie logic', stupid behaviours, and everything related.
Stupidity: A character on foot when chased by a boulder, vehicle, etc., will often run in the same direction as the object, rather than off to the side where the object can't reach.
Stupidity: When someone has duct tape put over their mouth and they're unable to scream for help, or warn someone coming in about a trap. Duct tape over the mouth easily comes off if you open up your mouth because it can't hold your jaw shut. And if you need a little help getting it off your lips because you can't open your mouth wide enough, just stick out your very wet tongue.
Stupidity: Highly trained military/police officers/similar in cover during a gunfight who stand up or run out into the middle of the street to shoot at their targets. Also including SWAT teams, supposedly the best of the best, who are bumbling incompetents and get wiped out near-instantly.
Stupidity: Some object (or person, occasionally, like The Mummy or the witch in Hellboy) which "can't be destroyed", but can be broken up into large parts and "hidden", often into ornate boxes with a map or record of the location. Nobody ever thinks to break the parts down into hundreds of pieces, then scatter them randomly into separate oceans, up a mountain, into building foundations, into a mine, or thrown in a volcano.
Stupidity: A group of people entering a haunted house, cave, etc. and splitting up instead of sticking together to protect one another. This happens in many but not all films when a group enters an area.
Stupidity: Idiot victims in horror movies run upstairs or hide in really obvious places rather than run out the front door.
Stupidity: Mostly a staple of horror movies, characters will incapacitate - and possibly even think they killed the monster/villain - and walk away without even going for a sure kill-shot with whatever weapon they used to bring the villain down in the first place. "Scream" is a notable exception to this.
Stupidity: Having long conversations in cars where the driver spends 95% of their time looking at the passenger rather than the road ahead.
Stupidity: Ground troops armed with semi-auto handguns, automatic rifles and even heavy artillery just keep wasting ammo, barrage-after-barrage, magazine-after-magazine, against giant robots and monsters 100 feet tall, long after it becomes obvious that the weapons have zero effect. This is an ongoing stupidity dating back to some of the earliest giant monster movies, and is still seen in giant monster and superhero films today.
Stupidity: A huge amount of movies and TV shows would be over in 5 minutes if only the person who just uncovered a horrible secret (such as who committed a murder) and is calling the good guys about it would quickly spill out of the gist of it instead of just setting up an appointment for a later meeting when they are supposed to discuss at length their findings, and which will only turn out to be the investigation of their own murder.
Stupidity: In several martial arts-themed movies or TV episodes, the fight advertised on the poster is not just the main event. It's the ONLY event. So people drive en masse and pay good money to get a seat for an event with no preliminaries, undercard...just watch with no warm-up something that potentially lasts 5 seconds.
Stupidity: Any time a character is using a shoulder lanched rocket system like an RPG, LAW, Stinger etc, they never check for the lethal back blast area behind them, frying your mates is seemingly acceptable. Same as firing from inside a room, car etc which would lethal to the firer and anyone else behind them.
Stupidity: Police officers or detectives pound on the door of a suspect, asking them to open the door. When they go into the house, they realise the suspect has escaped out the back door or window and have to give chase. Cops aren't this stupid. They surround the house first so the suspect can't get away.
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