Premier Date: January 23, 2003
busted
Adam and Jamie could not acquire real JATO rockets from the Air Force. As such, they used 3 amateur rocket motors of equivalent power to one JATO rocket. The rockets increased the speed of the car considerably. Although no speed measurement was made, the speed was clearly nowhere near the 300 mph suggested in the myth. The car also did not become airborne.
(This myth was supersized in Supersized Myths and tested a third time in JATO Rocket Car: Mission Accomplished.)
busted
There was not enough carbon dioxide produced by the reaction to make a stomach explode. The subject would, however, experience considerable pain.