Every once in a while, Moffat gives himself a little episode on the side to prove he's one of the best ever to write Doctor Who and he should still be in charge.
It always pays off.

ThePlumPudding
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DOCTOR: Question. Why is there no such thing as perfect hiding? Answer. How would you know? Logically, if evolution were to perfect a creature whose primary skill were to hide from view, how could you know it existed?
— Twelfth Doctor, Listen
(The Doctor is on a world tour. First we see him sitting on top of the TARDIS above the Earth.)
DOCTOR: (sotto) Listen!
DOCTOR: Question. Why do we talk out loud when we know we're alone? (blows out candle) Conjecture. Because we know we're not.
(He writes on his blackboard.)