Things to remember, a partial list
He is not an idiot. He has a perfectly functioning mind, if not a perfectly functioning memory, and he knows the sound of an early-model TARDIS when he hears one.
773 words; reading time 3 min.
That Subtle Knot
The Doctor tells his story, then reaches out to touch the waitress's hand. And freezes. Memory returns.
1474 words; reading time 5 min.