If a women is running away from someone she will trip and fall. Your car will always start immediately unless you are being chased by a maniacal killer or a monster of genetic creation. Crazed maniacs have super-human strength. Haunted houses are never locked. Murders will always be accompanied by sinister music.
Rich people are unhappy.
When someone is dead or dying, there will be a trickle of blood from the corner of their mouth. Christmas Eve and Halloween night last for three of four days. Midnight happens more than once in a monster movie. To kill a vampire, you must set out 5 minutes before sunset. Nobody ever realizes until the end of a monster movie, that everyone that went into tht dark cellar never came out.