We've seen it done in the movies - the perfect car slide in between two parked cars. Think of it as an adult slip n' slide. They guys start by testing pavement lubricants to see what works.

Kevin and Grant have built two versions of their trash can rocket and in true scientific method, they test them out without the propellants first to see if they are air-worthy.

The guys decide they can one up some epic cannon fails with their own homemade Gatling gun, customized to shoot meatballs. Check out the build of both meat and firepower.

After Grant and Kevin watch some three-wheeled destruction on the internet, they brainstorm how they could do it better - with motorized trikes.

Kevin and Grant want to do lawnmower jousting right, from armor to weaponry. The first step is comprehensive tests for the best jousting pole.

The guys are building their own "mini-weapons" to compete for accuracy, durability and distance. After Grant bends the rules, the game is on to build anything that will win.

The guys are inspired to see how many G-forces they can pull on a handmade merry go round powered with a motorcycle. They wisely try the first test with sandbags.

Kevin and Grant have completed the build of their electromagnetic gravity defying boots. Kevin takes the first turn and finds out it takes more than science to make them work.

Kevin bets Grant they can build a workable concrete canoe. Despite explaining the science behind how it could work, Grant is dubious. A steak dinner is on the line.

Before they start building their rocket powered skateboard, Grant and Kevin have too much fun doing thrust tests with leaf blowers and fire extinguishers. But, they form a plan.

Kevin and Grant weld an air cannon in Kevin’s garage to break Don Meredith’s football passing record of 83 yards. They bring the cannon to the field for a "slug" test. Is it record worthy?

After viewing typical science fair style homemade volcanoes, Kevin and Grant head into the field to build a giant version, complete with the three phases of volcanic explosion.

The guys are happy with their soapbox racer built to go off-road, but as always they want to test it before it goes into the field. They use Kevin’s street, curbs, and a bit of garden to start.

What is a James Bond test? Trying to stop a car going 30mph with no brakes, but lots of gadgets. Parachutes, air flaps and more are deployed.

The guys are serious about building a giant paper airplane that will fly 200 yards. Let the testing begin.

What could be better than having a beer delivered straight from the fridge to the garage? Kevin and Grant build a pneumatic tube system and start testing.