also made minor guest appearances in the episode, as the zookeeper and the zoo janitor respectively. Shields was dating future husband Andre Agassi at the time and during filming of the restaurant sequence, he stormed on to the set and according to witnesses had a blazing row with her as he felt she was flirting with Matt LeBlanc. Bright commented that Shields' performance was "a little into silly land" at first, but it "eventually turned in a very funny performance." Shields commented that when she was asked to appear on the show, she "said yes basically sight unseen. I don't know where I was on the list. Maybe everybody else said no." The writers had difficulty devising jokes that would be funny when Van Damme said them. In order to create "Van Damme-proof" jokes, one writer "would say them in a really horrible French accent, putting the emphasis on the wrong word". If people laughed, Van Damme was given the joke to perform. One line created in this way was Van Damme's "I can crack a walnut with my butt." Roberts recorded her scenes from January 6–8, 1996. She had a relationship with cast member Matthew Perry at the time and an audience member said about their on-screen kiss, "Julia looked at Matt and said 'I'm glad we rehearsed this over the weekend'." A sound recordist commented: "I've seen screen kisses before but this was the best. They really went at it." Roberts thought her appearance on the show was "the most nerve-wracking thing" she had done since auditioning for Pretty Woman. "I wanted to be the best I could be. [Perry] is incredibly funny, and you want to inspire that same kind of joy that he does. Then at a certain point at lunch, you go, 'Well, it ain't gonna happen. I'll just try to be cute.'" The decision to air the episode directly after Super Bowl XXX was made by NBC in hopes of making that Sunday the "highest-grossing ad-revenue day in television history." The guest stars were cast to draw more viewers and further increase the advertising revenue. In past years, networks had "exploited" the post-Super Bowl time slot to launch new series. NBC made an exception with Friends because they believed it would attract more advertising revenue than a new show. Curt King, press manager for Friends, commented: "Try to think of the new shows that