According to a medical report published in the January 1977 issue of Diseases of the Colon & Rectum (great bathroom reading! - ed.), a 49-year-old man was admitted to a San Francisco hospital complaining of severe pain. A "firm, fixed, round object" was found to be lodged high in his rectum. The man then admitted that he and his sexual partner had celebrated the Oakland A's World Series win by having a baseball inserted into his ass.
After the physicians tried various techniques to remove it, the baseball was finally "skewered with a corkscrew instrument" and pushed through an incision in the fellow's colon.
According to the medical report, "Follow-up examination a year later revealed normal bladder and rectal functions."