The rules, by Randy Meeks.

To survive an horror movie

#1: You can never have sex.
#2: You can never drink or do drugs. It's a sin. It's an extension of number 1.
#3: You can never, ever, ever under any circumstances say "I'll be right back," 'Cause you won't be back.

To create a successful sequel.

#1: The body count is always bigger.
#2: The death scenes are always much more elaborate - more blood, more gore - *carnage candy*.
#3: Never, ever, under any circumstances, assume the killer is dead.

(pos mortem) Super trilogy rules.

#1: You've got a killer who's gonna be superhuman. Stabbing him won't work. Shooting him won't work. Basically, in the third one, you've gotta cryogenically freeze his head, decapitate him, or blow him up.
#2: Anyone, including the main character, can die. It could be fucking Reservoir Dogs by the time this thing is through.
#3: The past will come back to bite you in the ass. Whatever you think you know about the past, forget it. The past is not at rest! Any sins you think were committed in the past are about to break out and destroy you.