04/11/2013 (09:00PM - 09:31PM) (Thursday) : EVERYONE IS UPSET WHEN THE ELEVATOR GOES OUT OF SERVICE - ROSEANNE BARR GUEST STARS - "Stairmaggedon" strikes the office when the elevator goes out and everyone is forced to take the stairs. Dwight (Rainn Wilson) forces Stanley (Leslie David Baker) to do an important sales call. Pam (Jenna Fischer) and Jim (John Krasinski) find comfort in talking with Nellie (Catherine Tate) and Toby (Paul Lieberstein) about marital troubles. Meanwhile, Angela (Angela Kinsey) stands by her man. Ed Helms, Phyllis Smith, Brian Baumgartner, Oscar Nunez, Kate Flannery, Creed Bratton, Craig Robinson, Ellie Kemper, Clark Duke and Jake Lacy also star.