(Right after Jack has seen Kate in Sawyer's arms, Ben walks into the observation room and Jack holds him at gunpoint)
Ben: If it helps, I was suprised, too. If I were a betting man I would have picked her and you.
Jack: Shut up!
Ben: Well, I suppose this would be the proverbial nail in my coffin.
Jack: (lowering the gun) Tomorrow.
Jack: Tomorrow morning, first thing.