My tribute to my Master! ^^ From the End of Time scene where the Master is wondering what he would be without the drums in his head. Multiple Exposure with the Untempered Schism he saw in his childhood.
This is my favorite moment with the Doctor and the Master. It just shows how vulnerable the Master really is. For a moment he's not insane and we get a glimpse of Koshkei, before the drums took him over.