ELKHART, Ind. - Detective Fred Mock knew exactly where to find a man suspected of stealing $180 worth of pennies.David Headrick, 19, was caught dumping about 18,000 pennies into a coin-counting machine at a grocery store Wednesday, Mock said.The pennies and a couple hundred quarters were taken during a robbery in which an 88-year-old man was tied up with a phone cord and punched in the head, Mock said."I got to thinking, `If I was a person who did this, I'd want to convert this to currency as quickly as possible,'" Mock said.Headrick was held Thursday on preliminary charges of...