Friends Season 4 Episode 18 : The One With Rachel's New Dress
Joshua invites Rachel to his parents' house, who are said to be out of town. She changes into a more revealing dress and Joshua and his parents walk in, much to her embarrassment. Phoebe is offered the chance to name one of the triplets and chooses 'Chandler' over 'Joey' when Chandler realizes he has a horrible name. When Phoebe leaves, it is revealed it was just a plan to get her to choose 'Chandler'. Ross suspects Emily of having an affair with Carol's wife Susan.