" Annabeth?” Percy said again. “You’re planning something. You’ve got that I’m-planning-something look.”
“I don’t have an I’m-planning-something look.”
“Yeah, you totally do. Your eyebrows knit together and your lips press together and—”
“Do you have a pen?” she asked him. "

― Rick Riordan , The House of Hades (The Heroes of Olympus, #4)