The other day I was on the highway, there was a little kid maybe 11 in a van that his mom was driving. They stop right next to my Z, and I see the kid with this huge grin nod and give me a thumbs up. I roll the window down and give him a thumbs up, and he looks shocked / scared. Mom pulls away.
Either something disturbing was happening behind me as I lowered the window, or I have a scary face.