Dearest Sister,
 
We have learned much about both friendship and modern pony society on this most wonderful of nights. However, We cannot help but wonder why Thou didst not see fit to inform Us of the myriad changes in etiquette and expectations that took place during Our millennium of exile. Findest Thou amusement in Thy sister trotting about the castle as a booming anachronism, no doubt striking terror in the hearts of the servants and inspiring titters of condescension amongst the lesser nobles? Rest assured, Sister, that the two of us will have much to discuss upon Our return to Canterlot.
 
With love and consternation alike,  
Luna