LOL! Love that lightbulb moment on a kid's face when it suddenly realises someone twice (or more) their age might actually have learnt a thing or two while they themselves were still in nappies. Having said that I picked up this self-same injury accidentally punching a car while running through a car-park so it 'can' happen without intent. Well I remember the amused look when in response to a query as to whether I got the car's number I replied that it was parked and I was the one speeding without due care...