If they really wanted to scare you they could just combine the two stories right....Babysitters who get high and masturbate to pornography while your kids are floating in the pool!!!!!!!!!!!!!!!!!!!!!!!
(you know it must be scary by the amount of exclamation points I've used
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I've never heard the story about the pool and the babysitter; I always thought that pot smoking babysitters preferred to cook the kids in the oven to help appease "The Munchies!!!!!!!!!"