A young boy is dropped off by his father at a children’s birthday party. In the small boy’s hand he is holding a little windmill that continues to spin at speed from one party scene to the next. Eventually the windmill comes to a halt. The party ends and the young boy is picked up again by his father in the new VW Golf Cabriolet. The acceleration of the cabriolet speeding off restarts the boys windmill spinning at speed. We realise at this point that it was the cabriolet’s acceleration that had original got the windmill spinning continuously throughout the party.