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Baby monitors are a wonderful invention that allows parents to leave their sleeping kids for a moment to get some much-needed alone time in another room without feeling (too) nervous—but monitors also have the unfortunate side effect of exposing just how creepy kids are when left alone. From children singing ominous music, to simply looking evil, to pulling off maneuvers straight out of an Exorcist sequel, there's a reason those Paranormal Activity movies are basically all filmed on baby monitors. After all, it's a lot cheaper and there's a seemingly inexhaustible supply of scares from the 0-3 crowd out there. Here are 12 of the creepiest babies ever caught on camera: