“You couldn’t just stay behind me, could you? you couldn’t stay in my shadow, where you belong. No, YOU had to go and fall in love with a monster! A nightmare! A freak of nature! Now everypony is all like, ‘Oh, look at Princess LUNA! She’s so sweet and thoughtful and forgiving! She’s SO much kinder and prettier than her older sister! Why isn’t LUNA in charge?!’” 

“IT ALL MAKES ME SICK!!! That should be ME they’re adoring! I should be the center of their attention! I should be the beloved princess! I SHOULD BE THE ONE THEY ADORE! I won’t stand for your rising glory any longer, sister! This needs to end… NOW!”

… Gee Day Breaker, calm down.