An ex girlfriend used to be a ghost hunter so I've seen a bunch of creepy Shit around graveyards and other haunted places. This one though, I don't tell because I can't even begin to expect people to believe me.
When I was little (5-6) my family lived behind a high school with 4-5 acres of athletic fields behind it. My bedroom had a huge picture window that overlooked those fields, and you could see the yellow sodium lights of the parking lot.
One night, I was woken up by the house rumbling violently - think like a minor earthquake - and I looked at the clock to see what time it was. I remember it reading 1:15am - and I noticed these weird lights coming through the window, like someone had left the tv on. I went to look and all I remember seeing was blackness. Not even the sodium lights were visible.
A few minutes later I hear my school alarm (set for 6:30a) going off, and see the reddish glow of sunrise on the horizon. What happened during those hours is a mystery to this day.