Fan 1: Why was this episode called The Sandwich? There were no sandwiches in this episode!
Fan 2: Lame.
Fan 3: Actually, if you pause the episode at 15:04 you can clearly see a sandwich sitting on the Tardis control panel.
Fan 1: Oooooh.
Fan 3: It must have some deeper meaning.
Fan 2: Maybe River put it there. Maybe its her sandwich.
Fan 1: What does it mean? Will Mofatt ever explain?
Fan 3: Clearly, it means The Black Guardian is returning!
Fan 2: No, The Rani!