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Airplanes: Whenever a flight crew is disabled and an inexperienced non pilot has to take over, the first button or lever touched will always cause the plane to instantly nosedive until frantic instruction corrects the cruising level.
Alcohol: In Twister, when they collect all the empty cans so they can fix them to the data-balls to make 'dorothy' fly, almost ALL of the cans are PEPSI(or other pepsi products) - there are no BEER or COKE cans to be found.
Aliens: If there is more than one or two of an alien race, they are always roughly the same size as humans.
Animals: Dogs always know who's bad, and bark at them.
Answering Machine: If the hero listens to his answering machine and one important message is unexpected then he usually has two very short messages on the tape before, one spoken by a man, one by a women. "Here'a John! I see you tomorrow at eight.".... beep ... "This is Sallieeeeee! I'll call again later." ... beep .... and then finally "Ahhhh! The killer is .....". If however the message is expected be sure that it will be the first one on the tape.
Asteroids: Asteroids are usually locked into orbits, but if a comet comes by, they can be bumped out of their rut and become dangerously unstable.
Bars/Drinking: Movie heroes in a bar will either order strong alcoholic drinks and swallow them down like iced tea or will ask for milk. The latter will always provoke sarcastic remarks and a fight will ensue.
Binoculars/Glasses: A villain will always commit murder right in front of the window when someone with binoculars is watching.
Biology/Genetics: Radiation causes mutation not to your future children, but to you, there and then. Mutation is never immediately fatal, but first either makes you into a formless blob, or a functional creature with animal-like features.
Bodily Functions: People never cough, sneeze, blow their noses, or show any other symptoms of being in less than perfect health.
Bombs: Evil geniuses who devise bombs to destroy things/people always have them detonate after at least an hour, giving the hero ample time to defuse it.
Cabs: Movie passengers either don't pay cabs at all, or have the exact change.
Cars: No one fumbles for car keys right before a car chase. they always jump right in and start the car up because they've left the keys in the ignition. Not a great idea in any major city.
Chases: Chasees will always stop to throw obstacles (trash cans, lumber, chairs) in their pursuers' way. No matter that they take three times as long to dump the obstacles as it takes the chasers to simply jump over them.
Clothing: Male characters generally are cold-natured. They need to wear jeans and leather jackets when the female characters are comfortable in cutoffs and a halter top.
Computers: High-tech computers, such as those used by NASA, the CIA, or some such governmental institution, will have easy to understand graphical interfaces.
Conversations: Two people will often converse while one stares out the window, with their back to the other. When an emotional point is made, the first person will turn around.
Crime: When you go to rob a bank in a film, you will always choose the teller who has just started his or her first day on the job.
Death: If a person good person dies with his eyes open, a friend will close them, and they will remain closed. If a villain dies with his eyes open, no one will close them, and the camera will linger on his face.
Dining: The hero and heroine in love always get a great table in a restaurant, even in New York City at lunch on Saturday (When Harry Met Sally).
Elevators: Movie elevators are always ready at that floor. But if the hero/heroine is being chased, elevator won't come.
Environment: Storms start instantaneously: there's a crack of thunder and lightning, then heavy rain starts falling.
Evidence: Incriminating evidence can be found either as photograph number four in a stack, or in the next to bottom drawer.