Last name of a circus sideshow and carnival attraction immortalized in "The Jerk", by the name of Darwin "Iron Balls" McGuinty. According to legend his nuts were bitten off by a rabid and psychotic groundhog in the late 1970s, and he was then fitted with a pair of iron testicles. His current gimmick is that in the sideshows and carnivals anyone who kicks or punches him in the balls and manages to make him double over gets $100, or $200 if he actually goes down to his knees. No one yet has ever gotten the money. Currently resides in West Virginia.
Iron Balls McGuinty has never once gone down in his career; too bad he had to be assaulted by Bucky the Killer Groundhog to be a star.