Anya, with that scene (the one with the "But I don't understand! I don't understand how this all happens. How we go through this. I knew her, and then she's— there's just a body, and I don't understand why she just can't get back in it and not be dead... anymore! It's stupid! It's mortal and stupid! And... and Xander's crying and not talking, and... and I was having fruit punch, and I thought, well, Joyce will never have any more fruit punch, ever, and she'll never have eggs, or yawn, or brush her hair, not ever, and no one will explain to me why!" speech), breaks my heart every single time.