10 Rules To Survive A Horror Movie
2. "Loose Lips Save Ships!"
The expression 'Loose Lips Sink Ships' might have been WW2 propaganda designed to keep the allies alive, but it's not something you want to stick to should horrors come a-knocking. Keeping secrets from the group is going to have the guaranteed knock-on effect of coming back to bite you later in the film, so you better all establish an open-door policy from the first whiff of trouble.
Think of how many zombie movies would keep a healthy chunk of their number alive if only one person had come forward about their suspicious bite wound sooner! Or just how much more quickly ghostly presences could be nipped in the bud if everyone KNOWS Sandra shagged on top of an ouija board whilst singing the Venom theme!
If everyone just admits their deepest darkest secrets from the outset, there's no reason for group turmoil to start killing people in place of any actual villains. No-one cares you like whipped cream in your ass. So shout it from the rooftops if you REALLY want to live.