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 Heppelwhite. 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 snort 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.