William Zabka — American Actor born on October 21, 1965,

William Michael "Billy" Zabka is an American actor, screenwriter, director and producer. Zabka is best known for his villain roles in several iconic 80s films, such as his role as Johnny Lawrence in 1984's The Karate Kid. In 2004, he was nominated for an Academy Award for co-writing and producing the film Most... (wikipedia)

Sometimes you become a character, and sometimes the character becomes you.
Prior to 'The Karate Kid', I did commercials - Kool-Aid, Pepsi, milk - and I had always been cast as the all-American nice guy.
Strangely, when I was a kid, my first acting job, at 5 years old, was a performance of 'The Three Little Pigs.' They cast me as the Big Bad Wolf.
Back when I was maybe 19, guys would go, 'I can kick your butt!' So I had a few showdowns. To my advantage, I learned martial arts, and what you really learn is not to fight.
My training in martial arts was kind of a crash course in how to look like a black belt. I know the moves of a black belt - my kicks, and my stretches, and my punches and all that.