The Times Online reports that “German youths have taken up a dangerous new pastime: firing potatoes as fast as a rocket from ‘bazookas’ made from drainage pipes.” The Kartoffelkanone are in some cases powered by the ignition of hair spray, and “at a range of 200 metres they could split a man’s head at 15 metres and penetrate a wooden wall at 90 metres.” And here I thought only American Rednecks armed with pumpkin launchers delved into the ballistics of produce…