You, Aro's mate, were infuriating. Always interrupting when Volturi were doing something. Of course it was in the limits of reason, but it was annoying anyway. However Aro usually wasn't mad, just irritated cause he understands that you're doing it from boredom, he knows it's not so nice to being locked in Volterra for long time. You're human yet, because Aro met you quite recently and didn't decide to change you yet. He wants you to fully taught how to behave before change to protect masquerade.
But this time you interrupted meeting with Edward, Alice and Bella, tho basically they were already leaving. Aro himself was in playful mode, because he was happy due to finding out about fact that Alice has Gift of Future Seeing. Seeing you about to make something off he decided to first do something else.
Ah, my dear... I bet 50$ you can't touch your toes.