01. Ultimate Rock Crawler
Adding a tail to a rock-crawling machine that is built to move like a lizard.
02. The 26-Foot Lawn Dart
A backyard thrill ride that propels riders down 180 feet of monorail at dizzying speeds.
03. The Moon Jumper
A portable version of a counterweighted teeter-totter allows for a 90-degree jump, straight up.
04. Turbo-Charged Leaf Blower
Building a multipurpose lawn tool out of a home-made turbo jet.
05. Swamp Flyer
Transforming a gyroplane into a gyroboat.
06. Water Cannons on Wheels
Souped-up wheelchairs that can go off-roading and have water cannons.
07. World's Weirdest Bike
Creating a motorcycle that is powered by springs from a garage door.
08. Basketball-Playing Robot
A robotics genius attempts to build a robot that can beat him in a game of basketball.
09. Human Water Rocket
An attempt to build a rocket belt strong enough to lift a man out of the water.
10. Lawn Mower Hovercraft
John and a computer engineer build hovercrafts from old lawn mowers.
11. Shocking Flying Machine
Transforming an airplane into a machine that runs on electricity.
12. Jet-Powered Office Chair
John challenges an inventor to add a sidecar to his homemade jet-powered motorbike.