Out on a bike ride today with my kids. My 9 year old son is cycling a little way ahead and suddenly stops to wait for me. A guy on a scooter vaping, probably around 17-19 had just passed him. My son was quite worried and said this guy gave him an upside down ok sign and smirked as he passed. It was a bit weird and I’m wondering if the sign meant anything? It did seem very harmless, but given the big age difference I thought it a bit odd.