While serving as ambassador to Italy, Clare Boothe Luce, a recently converted (and fervent) Catholic once found herself in conversation with the pope. As she grew more impassioned, a curious journalist leaned over to eavesdrop -- and heard the pope emphatically remark: "But you don't understand, Mrs. Luce. I already am a Catholic!"

[Needless to say, this tale is likely apocryphal.]