What is the spookiest thing to ever happen to you?

Here's an interesting thing that happened not too long ago; I still don't know quite what to think about it. I was driving through Northern Arizona with my sister and we'd stopped for the night in Page, at a motel. It was pretty late at night, 10:30 or so. I'd gone back down to the parking lot to get something out of my car, when I heard someone screaming. It was coming from the parking lot of the motel across the street and since I couldn't see anyone and they were several lights over there, I didn't think much of it. I figured it was kids or something. Until they kept screaming and louder. It sounded like someone was being burned alive or worse. A guy came out of the (my) motel at that moment and I asked him, "Do you hear that?" and he said, "Hear what?"