Had a lucid dream last night, in which I moved from the top of one skyscraper to the top of another in hardly any time at all (forget if it was flying or teleporting). An NPC (that is, a character that isn't me) spotted this strange phenomenon and asked me how the heck I could be on the other skyscraper that quickly since he took the quickest route humanly possible: go down the elevator, sprint to the next skyscraper and take another elevator to the top. After that, I spent a lot of time trying to explain, in vain, to the NPC that he's just an NPC inside my dream.