Dancing in (or on) the back seat

This is hard to demonstrate in still pictures, but to give some context: We were rocking out to some Nathaniel Rateliff (Need Never Get Old) on the way to the grocery store on Saturday and the song wasn't done. We asked Dad if we could stay in the car to listen to the end. Dad agreed and unbuckled John from his car seat so he could move around a bit. Chaos ensued.