#3 Hulk Hogan was originally supposed to be a redhead
Back in the early 1980s, Verne Gagne's American Wrestling Association was one of the hottest tickets in pro wrestling. Not only did they have Andre the Giant and Roddy Piper, they had a certain star in the making by the name of Terry "Hulk" Bollea.
AWA champion Bob Backlund allegedly refused to drop the title to Hogan, because of Bollea's lack of legit wrestling experience. So AWA sold Hogan's contract to Vince McMahon Sr.'s WWWF promotion.
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When the Hulkster showed up for work, the senior McMahon gifted him a bottle of red hair dye. Hogan was going to portray an Irish man and appeal to that audience. Hogan, however, feared the hair dye would exacerbate his already steady hair loss. So he poured the hair dye down the shower drain.
Now it's difficult to imagine Hogan as anything but a blonde, but he nearly debuted as a red haired Irishman.