do you ride a bike?

Monday, we went to take the hire car back. On the way, we stopped to get petrol.

Joe was driving the car, I followed on my motorbike so that I could give him a lift home. When we pulled up at the petrol filling station, we both got fuel, then both went in to pay. I was wearing my bike helmet and bike jacket. But the guy working behind the till still asked me "which one?". i said "the bike". he said "the car?"