Title says all. All quotes don't have to be true. Just don't get into religious things.
The creepiest thing i've ever heard of:
At 2 or 3 AM, someone is always watching you

I watched this video about creepy things kids have said.

"I'm copying the girl making the funny faces. Her braid is around her neck. She's hanging by her braid." The little girl copied a face that looked like that of someone gasping for air.