Mythbusters was a great and inspiring show, but they weren't always great at following the scientific method IMO. It was always more about cool hacks than scientific validity. They decided people being injured by bullets being shot into the sky was a myth mostly because they couldn't locate the bullets they fired into the sky, in spite of talking to one of the leading experts on the phenomenon, talking to a doctor that performed surgery on people injured by bullets fired into the sky, and discovering there are people in prison for seriously insuring people miles away by, once again, shooting bullets into the sky.
That was before Grant's time though, he was awesome.