Haunted houses are never locked. The police are smart. Good guys will only get shot in the arm or leg. Murders will always be accompanied by sinister music. Rich people are unhappy and evil.
Teenagers are smarter than their parents.
Thunderstorms spontaneously create murders. Computers never crash. Computers know everything. The user is typing constantly just to display screens of info 24. When someone is dead or dying, there will be a trickle of blood from the corner of their mouth.