Ross asks Rachel to keep Marcel for a day, and he gets out of the apartment. She calls animal control to help her find the monkey and later realizes that Marcel is among those monkeys which are not allowed to be kept as pets. The Animal Control employee is in fact a former schoolmate of Monica and Rachel, and she hates them, so they all race to find the monkey. In this race Phoebe gets hit by a dart which makes her butt fall asleep.
