In 1918, Fritz Haarmann "The Vampire of Hanover" embarked on a series of 27 savage murders in Germany. He cannibalized his victims, who were mostly young boys, by biting into their throats. And if the rumors are to be believed, he may even have sold some of their flesh on the black market as mincemeat. It took until 1924 before Haarmann was finally brought to justice and executed by guillotine.