Every once in a while a film will give the audience a sudden and unexpected shock rendering other scare-avoidance tactics useless - enter The Finger Fan. While not quite as subtle as other methods it’s still quite useful and once mastered can be very effective.
To perform a proper Finger Fan do the following: Place your hand over your eyes, spread your fingers apart just enough to let light through but not enough to see the scary scene. Done and Done.
You'll need to remove your hand soon after the audience settles down or you might have to tell your friends you’re yawning or have a headache. Of course, if you want to look like a horror stud just tell them you were facepalming the scene for being so dumb.