I sell industrial metals for a living. One day I had a guy on the phone asking me "What type of brass do you use to make a cannon?" It seems like his friends at the local VFW hall wanted to build their own cannon to shoot off on holidays. He was suprised that I didn't know in the first place - and was reluctent to sell him anything in the second place. "Well folks - sorry about the explosion that got those guys killed - but that guy Wesley that sold me the brass said it would work just fine!!" No thanks.