Before there was A Nightmare on Elm Street, before Alien there was "The Tingler" (1959). A parasite that attaches to your spine causing hallucinatory nightmares that kill you. It grows stronger when you are afraid. This film is a classic from the mind of horror director/producer William Castle. When the film came out there was also a device attached to seats in some movie theaters called Percepto! which when activated by onscreen action violently vibrated your seat. Tickets sometimes came with a Death Certificate saying that you died of froght!