The Doctor laid an inebriated Donna on her bed and poured her a glass of water. "Donna," he said, tilting her face towards him. "Where do you keep your paracetamol? I think you might need it tomorrow."

Donna giggled, "Drawer."

"Right...which drawer?" he inquired, but she'd passed out. "I'll find it," he sighed. He fumbled about with no success. Finally he tried the bottom drawer. There was the paracetamol...right next to a certain battery operated device sitting on top of a photograph. The Doctor's eyes went wide. There, in the picture, was his previous incarnation grinning back up at him.