While examining the principles of armor design, Grant and Kevin challenge each other to lawnmower jousting for backyard glory; the guys try a water-, shock- and bullet-resistant cell phone case.

Kevin & Grant try to reach 30 mph riding an makeshift Rocket Skateboard; a Catapult built from scraps is used in for a basketball shooting competition; Kevin believes the power of buoyancy will float a 400 lb Concrete Canoe.