Laconic / My Little Pony: Friendship Is Magic S2 E4 "Luna Eclipsed"

Princess Luna returns to Ponyville to confront her scary image... on the wrong night, in the wrong fashion. Hilarity ensues.
"Help! My unabridged version has been gobbled!"
"'TIS A LIE! THY UNABRIDGED VERSION IS WHOLE AND UNGOBBLED, THOU UNGRATEFUL TROPER!!" *Dramatic Thunder*

http://tvtropes.org/pmwiki/pmwiki.php/Laconic/MyLittlePonyFriendshipIsMagicS2E4LunaEclipsed