Having become the world's most popular razor since its 1998 debut, the Gillette Mach 3 obviously provides a superior shaving experience. Featuring three independently suspended blades, the razor was designed to provide closer shaves with less irritation than its competitors. Yet the Mach 3 caused plenty of irritation this week at the Democratic National Convention in Boston. The razors were included in about 30,000 gift bags distributed to delegates, dignitaries and the media. The bags also contained such convention essentials as subway maps, dried cranberry snacks and donkey-shaped macaroni and cheese. Problems arose when a number of people attempted to...