Described by medical personnel as 'a real whopper,' a 9-pound infant came hurtling down the birth canal of 27-year-old Jennifer Pischke like a bat out of hell Monday. 'Fire in the hole!' obstetrician Karen Mobley screamed as the infant careened off the sides of Pischke's fully dilated cervix like a Comanche on the warpath. 'This little cannonball's ready to blow. Gangway!' At press time, the baby, nicknamed Herbert 'Heads Up, Idaho Springs, We Got a Full-Throttle Runaway Locomotive on Our Hands' Pischke, was resting comfortably in a bassinet. 