Fullmetal Alchemist Brotherhood OVA 2 - Simple People

While on their way back to Resembool to have Ed's arm repaired, Ed and Al buy earrings as souvenirs for Winry to prevent her from getting mad about the broken automail. Later on, Ed fights an assassin and his automail gets broken again, and he buys more earrings for Winry to avoid her wrath. Winry explains that she decided to pierce her ears after meeting Riza on the day Ed decided to become a State Alchemist. Meanwhile, Riza explains to Rebecca that she grew her hair long after meeting Winry that same day. Rebecca comments on how simple a reason that is, and Riza says that reasons are always simple. To explain her choice, she remarks that they are all living in a simple world - where when they pull the trigger, their enemies die.