In the right context, cursing on the job can be cathartic. But in the wrong setting, it can stain a career — like in the infamous case of Charles Rocket, who was fired from Saturday Night Live soon after dropping an F-bomb during an episode on Feb. 21, 1981. This wasn't the dismissal of a frivolous bit player — Rocket had been singled out as a potential breakout star in the 1980-81 season, a polarizing and bizarre period in SNL history. The show's original executive producer, Lorne Michaels, left the sketch series with the intent of taking a year off...