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.