The Doctor fell. His last coherent thought before hitting the floor was a memory of tumbling down the stairs at the Farringham School in 1913.

The Doctor awoke, disoriented and feeling indefinably different. After a few minutes, he realized what had happened.

Blast, he thought. At this rate I'll have run through all my regenerations by next Christmas. Worst of all, this particular regeneration wasn't even a noble sacrifice or a heroically defiant gesture.

The Doctor sighed. Oh well, I'll just have to make something up, he decided. I have an image to keep up. I simply can't tell Martha or Jack that I inadvertently killed myself trying to change a light bulb in the TARDIS bathroom.

Time to check out the new me. Is it too much to hope I'm ginger this time, he thought hopefully.

He got up, faced the mirror and gasped in horror at the sight before him. Shaking violently, he sat down on the toilet seat. After several moments, he steeled himself to face the mirror again, hoping against hope that he had merely imagined his new face and body.

No such luck. Not only was he not ginger, he looked young, extremely young. In fact, the Doctor thought, he looked oddly familiar.

I've seen that face before, he thought. I must have unconsciously patterned my regeneration after him, whoever he was. Now, what was I thinking about right before the accident, he thought. Several minutes later he realized what had happened. Of course, the Farringham School, falling reminded of when I tumbled down the staircase. I must have inadvertently thought of one of the students as I regenerated.

Pulling himself together, he thought, I'll just have to pick out another form. I'm a Time Lord, I can do this, willing himself to change.

Some time later, the Doctor conceded defeat. Maybe he'd waited too long or maybe he was getting weak in his old age, but try as he would, his simply couldn't change into a more acceptable form.

No choice then, he thought despairingly. I have no choice but to spend my next regeneration looking like Tim Latimer, tiny, pale, elf-like Tim Latimer.