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Okay but hear me out.

At some point during seasons 1-4 Elias says something ominous to Jon and then adds “an old friend of mine used to say that the only way to get rid of a temptation is to yield to it”. Jon blinks once, twice and then answers: “Elias, that’s just a quote by Oscar Wilde”.

Silence. No one ever mentions this again.

Fast-forward to the middle of the apocalypse when Martin sees Jon stumble and suddenly say, completely unprompted: “He was friends with Oscar Wilde??????”