[Friends Season 1x21]  - The One with Fake Monica 

"The One With The Fake Monica" is the twenty-first episode of the first season of Friends, which aired on April 27, 1995.

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Monica's credit card is stolen, and along with Phoebe and Rachel, she decides to catch the thief. The thief turns out to be so charming and inspiring that instead of reporting her to the police, she hangs out with her, gatecrashing parties, auditioning for Broadway musicals and getting drunk. When the thief is arrested, however, Monica tells her everything, including who she really is, and confides in her how she doesn't want to go back to being who she was. The thief makes her realize that she can't change her personality.
When Marcel starts to hump everything in sight and in reach, Ross finds out that the monkey has reached sexual maturity. He submits several applications to zoo's, none of which are accepted. Just as he's on the verge to give up Marcel to an animal-fighting ring owner, Joey and Chandler bring news - Marcel has been accepted in San Diego. Ross prepares everything he needs, and shares a last moment with Marcel, who gives him a goodbye by humping his leg.
Joey enlists his friends to help him come up with a less ethnic-sounding stage name. Chandler jokingly comes up with Joseph Stalin, which Joey regards as good. Of course, this stage name does not get him far with producers and directors, who don't hesitate in pointing out to him that a Joseph Stalin already exists, and how he's far from being an actor. Not long after, he presents himself to a Romeo & Juliet audition for the role of Mercutio as Holden McGroin (holding my groin).