After placing her order (she added some chips for the table to munch on), sally had to laugh at Percy's earlier comment, "Deducting points retroactively? But Percy, you don't know what to take points away for. I could have skipped class, I could have been late for curfew, I could have even organized in a group larger than three during Umbridge's tenure." That last bit was said conspiratorially. It wasn't just the DA that had been affected by that decree. She and her friends could play chess, but heaven forbid anyone watch them do it.
"Or maybe I copied someone else's homework - History was always so tedius. Maybe I snuck into Hogsmeade before I was a third-year. I'm pretty sure doing it at least once is a Hogwarts right of passage." She was having fun with it now. But eventually she shrugged. "Or maybe I really was a perfect little student, who never did anything wrong. Up to you which version you like better."