Season: 4

Chandler hits on a woman at Central Perk, not realizing she is Joey's new girlfriend. He soon realizes he is very attracted to, possibly in love, with her. Ross and Rachel play the jealousy game in their relationships. And Phoebe desperately tries to catch a cold after discovering that her voice is sexier and her singing better when she has phlegm in her throat.

Joey attempts ballroom dancing in order to help Monica and Rachel keep their illegal sublet. Phoebe is attracted to one of her massage clients. And Ross tries to help Chandler quit the gym.

Monica caters a party for her mother, who still doesn't quite know how to talk to her daughter. Chandler's encounter with Rachel's boss leads to an embarrassing situation. And an encyclopedia salesman takes advantage of Joey.

Phoebe believes that her adoptive mother's spirit resides in a cat that jumped into her guitar case in Central Perk. Monica goes on a date with Rachel's hunky high-school boyfriend, who was cool in high-school, but a failure now. And when Joey and Chandler decide to sell the entertainment center, Joey takes stupidity to a new level.

Ross chooses between Rachel and his bald-headed girlfriend Bonnie. Phoebe struggles to deal with the revelation that her mother's friend is actually her mother. Monica gets stung by a jellyfish, forcing Chandler and Joey to step up to the plate in order to relieve her pain.