Erlkönig: contraceptives.shtml

A doctor, awakened by a phone call in the middle of the night, hears a
frantic young woman on the other end: "Please, you have to come right
over," she pleaded.  "My child swallowed a contraceptive!"
    Dressing quickly, the doctor is about to walk out the door when the
phone rings again.  "It's okay, you don't have to come over after all,"
the mother says, with a sigh of relief. "My husband and I just found
another one!"