5x12 "The One with Chandler's Work Laugh"

Monica finds out that Chandler kisses up to his boss at work and starts to lose respect for him, but behind her back, Rachel is trying to get Monica to confess her secret. However, when she doesn't, Rachel feels hurt that Monica is apparently unwilling to confide in her. Ross learns Emily is engaged again, and has a one-night stand with someone the group is all too familiar with, Janice. Later, Janice breaks up with him though, as she ironically "can't take another second of [his] whining."