The women of the office try to teach Dwight how to interact with female clients; Angela suspects the senator of cheating; Toby convinces some of the guys to grow mustaches.

Pam accidentally brings lice into the office and lets Meredith take the fall, while Dwight vows to destroy the parasites. Meanwhile, Jim has a fantastic day in Philly wooing a potential business associate. Meanwhile, Phyllis, Nellie and Kevin meddle in Darryl's love life.