[Problem, Luna? It's probably a good thing that she can't see Discord right about now; the image of her bouncing around with glee probably wouldn't do too much to brighten her spirits.]

[Tone: jovial surprise]
"Goodness me, it seems like I've struck a nerve. Perhaps you weren't being entirely honest with yourself, hm? You know, lying isn't a good habit to have when you're Canterlot Royalty. It might get you over your head."