http://www.washingtonpost.com/lifestyle/style/mythbusters-cannon-ball-accident-caused-by-unforeseen-bounce/2011/12/08/gIQABK68fO_story.html
Click the link to see the video. This article is a bit old, December 8th 2011, but its for the current season in production. Its pretty messed up that someone could have been killed by a stray cannon ball, but at the same time, those ppl were living right next to a bomb range.