Protestant Reformation
A movement started by a man, Martin Luther, who thought he knew better than 1500 years of theologians and Church teaching.
Person #1: Who was the antisemitic, sexist guy who broke away from the Catholic Church, starting the Protestant Reformation, and thus single-handedly destroyed Christian unity?
Person #2: Martin Luther.
Person #1: Oh.
Person #2: Martin Luther.
Person #1: Oh.