Haunted houses are never locked. Women will faint at crucial times. Good guys will always get shot in the arm or leg. All Chinese people know karate. Murders will always be accompanied by sinister music.
Rich people are either unhappy or private detectives.
Teenagers are always smarter than their parents. Teenagers who have sex are destined to die in grotesque ways. There are no ugly women, only ugly men. Thunderstorms spontaneously create murders. Computers never crash.