text: One of the special effects he employed made it appear as if he was able to look through his assistant Barbara Loden's head.  The illusion was performed by placing a black patch on Loden's head and standing her against a black background while one studio camera was trained on her. A second one photographed Kovacs, who used the studio monitor to position himself exactly so that his eye would appear to be looking through a hole in her head.
  He also developed such routines as an all-gorilla version of Swan Lake, a poker game set to Beethoven's Fifth Symphony, the skit Silent Show, in which Eugene interacts with the world accompanied solely by music and sound effects, parodies of typical television commercials and movie genres, and various musical segments with everyday items (such as kitchen appliances or office equipment) moving in sync to music. A popular recurring skit was The Nairobi Trio, three derby-hatted apes (Kovacs, his wife, Edie Adams in gorilla suits; and frequently, the third ape was Kovacs' best friend Jack Lemmon) miming mechanically and rhythmically to the tune of Robert Maxwell's "Solfeggio".
  Kovacs used extended sketches and mood pieces or quick blackout gags lasting only seconds. Some could be expensive, such as his famous used-car salesman routine with a jalopy and a breakaway floor: it cost $12,000 to produce the six-second gag. He was one of the first television comedians to use odd fake credits and comments between the legitimate credits and, at times, during his routines.