text: Visual humor and characters At WPTZ, Kovacs began using the ad-libbed and experimental style that would become his reputation, including video effects, superimpositions, reverse polarities and scanning, and quick blackouts. He was also noted for abstraction and carefully timed non-sequitur gags and for allowing the fourth wall to be breached. Kovacs's cameras commonly showed his viewers activity beyond the boundaries of the show set—including crew members and outside the studio itself. Kovacs also liked talking to the off-camera crew and even introduced segments from the studio control room. He frequently made use of accidents and happenstance, incorporating the unexpected into his shows. In one of Kovacs's Philadelphia broadcasts, Oscar Liebetrau, an elderly crew member who was known for often sleeping for the duration of the telecast, was introduced to the audience as "Sleeping Schwartz." Kovacs was once knocked unconscious when a pie smashed into his face still had the plate under it.
  Kovacs's love of spontaneity extended to his crew, who would occasionally play on-air pranks on him to see how he would react. During one of his NBC shows, Kovacs was appearing as the inept magician Matzoh Hepplewhite. The sketch called for the magician to frequently hit a gong, which was the signal for a sexy female assistant to bring out a bottle and shot glass for a quick swig of alcohol. Stagehands substituted real liquor for the iced tea normally used for the skit. Kovacs realized that he would be called upon to drink a shot of liquor for each successive gong. He pressed on with the sketch and was quite inebriated by the end of the show.