I dont mean the most blood thirsty but the one that really un-nerves you. Mine is Sophies Coiice in the film by the same name. I did not see the whole of the film but I was waking up with the chills...
In the Back to the Future trilogy they kept banging on, on how a paradox could destroy the universe. Eg if Marty never got his parents back togethter he would of never of been boorn, do he would of...