What's your most mysterious life experience?

I had a really weird experience. I was a little kid, so I'm not sure how old exactly but probably 7-8. We were going on a car ride of some kind, so I'm sitting in the backseat. It's dark out, and looking back at it the streetlights and the shadows they make on the ground appear to be moving backwards. Needless to say I was young and this experience was so weird that it's just not something I'll ever forget. What's your most mysterious life experience?