It is unlawful to manufacture or sell exploding golf balls.

The Law

Pennsylvania penal code specifically prohibits the sale, manufacture, or possession of a golf ball that contains any explosive substance. In the 1960s, exploding golf balls were a popular gag gift designed to detonate with a loud bang when struck, but they frequently caused severe eye and facial injuries. The state intervened to ensure that the golf course remained a hazard only to a player's ego.