The One with Chandler's Work Laugh Friends : Season 5 Episode 12

Monica begins to hang out with Chandler during his work functions, since they don't have to keep their relationship a secret among his coworkers. However, she learns that Chandler has a second, more annoying personality when he's around his boss. Meanwhile, Ross learns that Emily is getting remarried and in his grief hooks up with an old nemesis of the gang: Janice.