"When there is a thought that stays in your head that makes you feel bad. Scared or sad or mad or all of that." Barty supposed that explained it. He was back to driving by now, focused on the road but glancing at her every now and then. "You should eat the pie. It's nice. But be careful, the inside is hot."

He gestured to what he meant and made sure she actually opened the packaging right. Smart girl. "Worries aren't all bad. They can make you focus on what matters. But they can drag you down too."