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Madcap Maxie was one of Max Baer's nicknames, alongside "The Livermore Larruper." Baer earned this moniker due to his eccentric and unpredictable behavior both inside and outside the ring. Known for his wild antics and flamboyant personality, he often engaged in playful pranks and humorous stunts, cementing his reputation as a charismatic and entertaining figure in the boxing world.