4. Pay Attention To The Soundtrack
Every fan of slasher films know that the people that are REALLY controlling who is going to get killed and when are the composers of the soundtrack. Screeching strings are a dead giveaway, for starters, and have been since, like, the 1950s. Ominous bass rumblings tend to be a false alarm, a clever way of raising tension. Better to wait until the score goes quiet - that's when you can assume that something big and LOUD is coming. Oh, and never, ever trust any "pretty" moments in the soundtrack. If a harp or a minor piano part comes in towards the end of the film, you know it won't last. It's a fake moment of blissful respite, designed to lull the audience - and you, the victim - into a false sense of security before the final shock hits.