ELLETTSVILLE, Ind. -- When Jim Bristoe told his wife he wanted to build a cannon that would shoot a pumpkin a mile, she told him he wasn't all there. But he built one anyway, with a 30-foot-long barrel. It is powered by a 700-gallon air tank and is appropriately named "Ain't All There." It looks much like a mobile anti-aircraft gun. "You don't need to cover your ears, but you're going to know I shot it," the 42-year-old electrician and mechanic said during a demonstration on Wednesday. When Bristoe fires the cannon, a 10-pound pumpkin is hit with 11,300 pounds...