Best Publicity Stunt Ever?

Did anyone see the new Jaguar X.F. which took a New World Record by the distance a car has travelled by wire. It crossed the Royal Victoria Dock, (Over water)
Hanging underneath was a very large Jaguar logo.The cars wheels all had tyres on them, and there was obviously a wire under the front and rear wheels.both sides.
One of the best publicity stunts to promote a vehicle I have seen.
What springs to your mind as to the best Promo Ad you have seen.Any Ad, not just cars.
Jim.
Lincoln .7