Do they know how lucky they are? Taking turns with an electric offroad ATV (www.trailhog.com) - the Yamaha Grizzly ATV (hardest working, toughest ATV) - and a bright yellow gocart which is just low enough to ensure bugs and grass in your teeth (thus the goggles).

When I was a kid you ran around the house making sounds, maybe on a bicycle, and now they argue between which machine based on color, speed and comfort.