I was reading Fearless Fourteen by Janet Evanovich and one of the characters was attacking people with a potato cannon and other edible/inedible items. I thought this was a joke but I Googled it and it's real (PVC pipe, a potato, hairspray for a propellant and a lighter to ignite). I thought I had an enriching childhood growing up in New York but this escaped me.
With all the violence in the world, we do not need more weapons and I'm not advocating a Living Room discussion on gun control or the right to bear arms. But, I did think a potato cannon is fascinating and might be of interest to others, especially since this information is out there. I hope this post is not viewed in poor taste.
The link is for one of the hits and it has excellent photographs, a legal disclaimer and a common sense response from the Bureau of Alcohol, Tobacco and Firearms.