4x03 "The One with the Cuffs"

Chandler dates Rachel's boss, Joanna, again and finally breaks up with her after she handcuffs him to her office chair. Rachel then comes to Chandler's rescue, with doubts as she realizes she could get fired for going into her boss's office. Monica caters a party for her mother, but while preparing the food she loses a fake finger nail in the quiche, ruining her plans to impress her critical mother. A salesman (Penn Jillette) comes to Chandler and Joey's apartment selling Encyclopedias and starts teaching Joey things from the books.