The two red mares experimenting with an age regression potion. Shatter (The lighter red pony) had her and her counterpart, Ponified Shatter (The darker pony with gray socks), drink a mental regression potion. Ponified Shatter drank all of it, while Shatter drank like half of it. But before taking the potion, they put themselves into diapers, in case the potion caused “other” effects.