I'm betting on an ancient Indian burial ground.
Don't fall asleep with the TV on.
Don't go toward the light if you hire a midget occultist.
Don't go in the swimming pool with floating corpses.
Don't build on Indian burial grounds.
Don't drink teguila with a live worm.
Don't piss off a cult leader.
Things I learned from Poltergeist and Poltergeist II