I couldn't decide so 5. I'm soooo sorry!
It was thing to celebrate his victory of taking over the earth, it was quite another to get so drunk even he was incapated by it. The Master didn't remember anything happening since the Academy really.
Come to think of it, after his 13th or 14th glass of...what alien liquor one of his staff had had stashed away that he'd managed to confenscate, the Master only vagually remembered anything. Except that the pounding in his head wasn't his precious drums. Those had never hurt before.