In The Lord of the Rings Online, there is a quest which temporarily gives you control over a mook, guarding a prison. You are tasked with cleaning out vermin and waking the sleeping guards, in preparation for a visit from the Big Bad. The Big Bad proceeds to interrogate a prisoner, but the interrogation is cut short by some intruders who are never seen (the quest ends just before they arrive). The time between doing the two quests may have had something to do with it, but it didn't occur to this troper until some time after finishing the quest that the intruders are in fact the Player Character and his/her group, who in a earlier questline were tasked with rescuing that prisoner.
Speaking with the dwarves trying to reclaim Moria will reveal that they change between calling the place Moria, and Khazad-dûm. The brilliance kicks in when you notice that Moria (meaning "Black pit", basically a derogatory term) is mostly used when talking about the place in negative terms, whereas Khazad-dûm (meaning "Dwarves' Mansion(s)", a more flattering term) commonly is used in a more favorable, optimistic light; "Darkness dwells yet in Moria" versus "We will reclaim Khazad-dûm for Dáin Ironfoot". The dwarves are distinguishing between Moria, the "Black Pit", the hostile place that they're currently exploring, and Khazad-dûm, what it will be when restored to its splendor.