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Williams is perhaps best known for giving up the game-and-World Series-winning home run to Joe Carter and the Toronto Blue Jays in Game 6 of the 1993 World Series.
However, he is also known as "Wild Thing" for his unusual delivery to the plate
"When he joined the Cubs, his extravagant wind-up and release and his frequent wild pitches inspired Wrigley Field organists to play The Troggs' Wild Thing as he came out of the bullpen.
A power reliever, he put his full weight behind every pitch, so that he dropped hard to the right, sometimes falling off the mound.
He was often compared to film character Rick "Wild Thing" Vaughn (played by Charlie Sheen) in the 1989 David S. Ward film Major League.
In 1993, Williams started wearing the No. 99 (he originally wore the No. 28) on his jersey, the same number that Vaughn wore in the film.
According to an interview on the Dan Patrick radio show on 10/22/08, the number change had nothing to do with the film Major League.
Williams said he had wanted the No. 99 for years because of an admiration for the football player Mark Gastineau, who also wore No. 99. Williams said he didn’t change his number until 1993 because that was his first chance to do it."
Either way, the nickname stuck, as did the movie. Although Williams' long mullet locks are long gone, the moniker follows him wherever he goes.