Michael and Jan attend a party at a Dunder Mifflin bigwig's home, where they finally go public with their heretofore hushed romance. While at the party, Jim meets Karen's ex. And the rest of the office dwellers are also in a partying mood, as they head out for a boozy happy hour.The promos, with Michael’s straightjacket, look hilarious. Would Herc be happier if Abrams spent the week writing a “Lost” episode instead of directing an “Office” episode? Yes, Herc would! “The Office” is plenty funny without Abrams’ help. But the two “Lost” episodes Abrams wrote with Damon Lindelof defined the greatness of “Lost.” Will Herc skip tonight’s “The Office” in protest? No, Herc will not skip tonight’s “The Office” in protest! And you’d best not either! 8:30 p.m. Thursday. NBC.