S8E11: The One with Ross's Step Forward

Ross starts to panic when Mona suggests that the two of them could send out a holiday card together, thinking that their relationship is starting to move too fast. Chandler's newly divorced boss tries to get Monica and Chandler to go out to a dinner with him, but Monica can't stand him, so Chandler steps up to cover for her. Meanwhile, Rachel's hormones start acting up due to her pregnancy, causing her to hit on almost every guy she meets.