Turing test.
I never read that one.
To my eternal shame I took my huge collection of #DoctorWho books to a charity shop in about 2009, thinking I would never read them and that someone else should get some pleasure from them. Aside from some New Adventures, there was an almost complete collection of Targets from my childhood... that I thought I'd never reread.
Within a couple of years I'd had a son. I'm still kicking myself...