Offline
As soon as I heard it, I thought, 'that sounds familiar, where's that from?'. Youtube was a big help. Here at 3.44. No spoilers, but a hint of a real life bromance.
Offline
And of course it is a quote from "The Final Problem".
Offline
Ah, that's where it's from. Moffat just said Doyle, that was a bit too unspecific for me.