What’s the quietest thing a kid ever said to you?

Just had a moment with a 9-year-old who’d been silent for three days. Then, out of nowhere: 'I think my shadow’s tired.' I didn’t know what to do with that. It wasn’t sad. Not funny. Just true. Like he’d seen something in the light no one else noticed. Now I keep wondering—what’s the smallest thing a child has ever whispered into the world and made it heavier?