S8, E13: As Joey agonizes over his secret affection for Rachel, Monica mistakenly thinks that he is infatuated with Phoebe. When Monica reveals her suspicion to Phoebe, the confusing romantic situation becomes chaotic. Meanwhile, Ross and Rachel agree not to learn the sex of their unborn child, but Rachel sneaks a peek at the doctor's confidential folder. Monica urges a reluctant Chandler to enjoy the soothing pleasures of a scented bath, but soon she can't get him out of the bubbles.