Friends reunion, but none quite so unexpected as David Schwimmer’s dislike for Marcel, the monkey who guest-starred on the show.WATCH BELOW: David Schwimmer Hates Marcel the MonkeyDuring the reunion, when asked if there were any moments the cast did not enjoy when filming the show, David told the live audience about his difficult working relationship with the capuchin monkey.“Here is my problem, the monkey, obviously, was trained.