Pointing A Hoof (Closed RP with Discord)
Luna stomped out of the castle with her guard Elvira tailing her.
"Your Majesty! You may be overr-reacting! This could be anything. This doesn't necessarily mean it's the work of--"
Luna stood at the balcony of the palace and sang out, a soprano B-Flat that carried the extra weight of her Canterlot Royal Voice.
"DISCOOOOOOOOOOOOOOOOOOOOOOOOOOOOOORD!"
Lightning lit the night sky. She raised her voice, still singing. "Show thyself to us! For this prank is no longer FUUUUUUNNNY!!!"
Only Discord would have the power to pull this off, as the curse was resisting any of Luna's magic and she could not think of anypony else who would curse her to sing constantly. It was utter nonsense!