- SWIPED FROM REDDIT -
So I was wandering Dalaran doing my crafting quests when I see someone named Arcanomancer Vridiel say (not a whisper or anything, just the NPC equivalent of /say) "[Me]! Is it true? Do you wield Felo'melorn? Come, speak with me!"
It took me a few minutes (he's actually the blacksmithing trainer, and I was on the street, so finding him wasn't quite as easy as it should have been), but when I talked to him he asked if he could hold my weapon. I said yes, he made a little speech while holding it, and I got 50 Artifact Power.
The moral of this is pay attention to the NPCs. I don't know if there are any more of these tucked around the game, but it's worth pointing out.
It was pretty neat. :)