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. 2015/12/06

The girl in the leather jacket isn't as pudding-brained as everybody else.
309 words; reading time 2 min. 2015/12/25

The Doctor tells his story, then reaches out to touch the waitress's hand. And freezes. Memory returns.
1474 words; reading time 5 min. 2016/01/16