Hoenest on Instagram: "🎬 Fact: Friends (Season 1, Episode 10 – “The One with the Monkey”) The monkey who played Marcel was actually a female capuchin named Katie, and she required her own dedicated trainer on set. Despite appearing calm on screen, Katie was notoriously unpredictable during filming — often climbing onto cameras or refusing to stay in her mark. David Schwimmer (Ross) later admitted in interviews that working with the monkey was “fun but incredibly frustrating,” as many takes had