Remember when Jack Johson got knocked out in the third by a Jew called Choynski, and they both got locked up in the county jail in Galveston, Texas for "illegal prizefighting," and while they were in there, they practiced sparring, for spectators, with the permission of the warden, and Johnson learned new techniques from his opponent who was older and showed him a few things, and then in 1908, Jack Johnson became the Heavyweight Champion, known as the Galveston Giant
