A 'Car Twin Wave' is where someone with the same car as you, and the same color, becomes very excited to see you and bursts into a fit of spontaneous waving. Sometimes a honk of the horn is in order.
It happened to me in the petrol station. I was at the pump when an identical Fiat 500 pulled in and the lady driver did a big enthusiastic wave and a smile. I couldnt help but smile and wave back.
Good Times.
