So it was prophesied a couple of seasons back that the Doctor would come to a place where he would be asked the first question, the question that must never be answered, the question hidden in plane sight. (Doctor Who?) He could not answer falsely or withhold the answer. It seems that that episode is coming up this week.
Possible Spoiler(I don't know what's going to happen but I have an idea.)
If I were in his place I would play my "Pocket Watch" thereby erasing my memory. That way I could answer that I don't know and it would be the truth.
End Possible Spoiler.
What do you think?