There is no such thing as mass psychosis, it's zombies. Did we not learn anything through dozens of zombie films already? Just start gathering supplies and practicing head shots.
Always wear appropriate clothing. No one ever seems to be properly attired in these things. They start off on a road trip with suitcases and when they reach the creepy camp or abandoned house, suddenly all they have are flip flops and shorts. Ladies, you might also want to keep track of your bras. They disappear with inexplicable frequency in horror films.
Keep it in your pants. I know it's tempting, but avoid having sex on graves, in old barns, derelict houses and, or abandoned psychiatric hospitals. Think tetanus shots if nothing else, but you know the killer/zombie/monster will always get you with your pants down.
That shape at the end of the hall is NOT your friend. Keep your mouth shut and keep moving. Don't you just love it when the vics see a giant shuffling shape and call out "Tiffany, is that you?"
Go to the bathroom in groups. Safety in numbers, kids. Nothing like going for a quick pee all by your lonesome and the monster/killer comes up behind you because you didn't bring a friend for lookout.
If the walls or floors start to bleed, LEAVE. Don't bother to call a priest or a psychic, that house is seriously freakin' haunted. GET OUT!
If there's a strange lunatic guy telling you you're going to die in there, DON'T GO IN THERE. How hard is that?
Stay out of the basement. Nothing good ever came from heading into the creepy basement. Unless you're fleeing a tornado, but seriously in horror, how many of those have you encountered?
Don't skinny dip. Come on, now. You know the monster is always in the water and the killer on the shore by your clothes.
No matter how bad the weather, STAY OUTSIDE. That scary looking house is not going to yield any sort of help. Think about it. The place is dilapidated and dark, do you really think you're going to find help in there?
Don't call the cops. They're useless cannon fodder unless it's near the end of the movie when they drive in en masse AFTER it's all over.
Don't ask what the noise is, HAUL ASS. How easy is this one? The noise is always bad news, so just run the fuck away.
So there you have them, my twelve simple rules for surviving horror. Now, I can't guarantee you'll live, but these rules will up your odds.