Princess Luna has been stuck on the moon for a thousand years, so she has a lot of catching up to do, especially on sweets. One boring afternoon, after waking up from her nap, she meets up with her sister in the kitchens, where her sister teaches her about the new treat Twilight Sparkle has bought from the land of walking on two hooves. Ice Cream. Let's just say, Celestia didn't fill her sister in about the other parts on eating ice cream. Such as, brain freeze.