The next morning she received a note saying

Dear Annabeth,

I'm so sassy.

Love, Persassy. J

Annabeth had no clue how Percy was going to pull this one off. Yesterday, she told him to quit. He said he is staying sassy until she calls him Persassy, so he can be sassier. He made no sense, so Annabeth just laughed. By lunchtime, he hadn't done anything yet, so she wasn't sure he'll do anything. She wasn't paying attention to the little speakers installed in the tables when she sat down.
Out of nowhere, music started playing. Percy stood up at his table and a started singing. "I'm so sassy, you already know! I'm in the fast lane, from Greece to Rome!" Annabeth was cracking up after that outburst and was smiling walking back to her cabin.