"Luchadores" are traditionally divided into two categories, "rudos" (lit. "tough guys", who are "bad guys", or "heels"), who bend or break the rules, and "técnicos" (the "good guys", or "faces", literally "technicians"), who play by the rules and their moves are much more complex and spectacular. "Técnicos" tend to have very formal combat styles, close to Greco-Roman wrestling and martial arts techniques, whereas "rudos" tend to be brawlers. "Técnicos" playing the "good guy" role, and "rudos" playing the "bad guy" role is very characteristic of Mexican lucha libre, which differs from U.S. professional wrestling, where many technical wrestlers play the role of heels (e.g., Kurt Angle), and many brawlers play as "faces" (e.g., Stone Cold Steve Austin & The Rock). Although "rudos" often resort to using underhanded tactics, they are still expected to live up to a "luchador" code of honor. For instance, a "luchador" who has lost a wager match would prefer to endure the humiliation of being unmasked or having his head shaved rather than live with the shame that would come from not honoring his bet. "Rudos" have also been known to make the transition into "técnicos" after a career defining moment, as was the case with Blue Demon, who decided to become a "técnico" after his wrestling partner, Black Shadow, was unmasked by the legendary Santo. Tag teams are sometimes composed of both "rudos" and "técnicos" in what are called "parejas increibles" (incredible pairings). "Parejas increibles" highlight the conflict between a "luchador"s desire to win and his contempt for his partner.