You know that MTV show that was made into a movie, where crazy (stupid?) teenage guys perform stunts that inevitably result in bodily harm? (Name: Jacka**)
Unfortunately, that culture has migrated across the Atlantic, although to some extent boys-will-be-boys all around the world.
In this specific case some German, um, innovators lay a motorcycle on its side so that it can power a playground carousel. And we're talking real pocket-rocket... lots of power available. The guy in the red pants is great -- his friends keep it slow for a few revolutions so he has time to get another drag on his cigarette before handing it to a nearby friend. Then he gets a short but thrilling ride:
Just before they really get going you hear "halt fest!" which means "hold on tight!". At least one guy listened.