glengineer writes "Just when you thought it was safe to buy a Segway, Popular Sci has an article on the Monster Monowheel, an 1,100 pound single wheel 'scooter'. From the article: '...works on the hamster-in-a-wheel principle: Move a wheel's center of gravity forward and the wheel turns.' It has an 80cc four-stroke Honda scooter engine and 80 pounds of lead for ballast. Scary part: the driver's seat is in the very front, and the seat scrapes the ground when braking really hard." The builder's website is theriotwheel.com.