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Things That Do:
When children are murdered
When a person is cut in half (vertically or horizontally)
When zombies outnumber a small group and attack
Demonic possesion
When a slasher/killer/psycho keeps some momento from their victims.
(i.e. clothing, part of a body, picture)
Some forms of torture
Things That Don't:
Ghost stories
Killer dolls or any toys for that matter (like Chucky )
Gun shot kills to the chest
Psycho families that attack unsuspecting teens(and manage to go vitually unnoticed by the aurhorities for years)
Underwater animal threats (with the exception of JAWS of course)
....more to come