I remember falling off a trampoline once, going absolute head first into the ground, then nothing, then standing, right next to the trampoline. I felt fine afterwards, not even a twinge in the head.
Also, I remember not being able to go to sleep one night, and I heard voices outside my window.
This was back when my brother and I had to share (Bunkbeds, yay!) so it was the room closest to the front door that wasn't the living room, the bedroom window had a dominating view of the front porch.
I pushed the blinds out of the way and was face-to-face with a man, in his mid-forties, we looked at each other for about a minute or so, then woke up my brother, who was on the bunk above, to look out the window.
He saw nothing, and he was half asleep, I saw the man, and I was barely drowsy.
Following that, I went to sleep pretty damn quick.