What’s the quietest thing you’ve ever noticed?

This afternoon, I was refilling a prescription tray and heard the faintest click—just one. A single pill dropping into place. Not the clatter of the machine, not the hum of the fridge, but that tiny, almost imagined sound. It made me stop. I’ve spent years counting pills, watching them flow like sand through fingers, but I’ve never really listened to them land. What’s something small and silent that snagged your attention lately? Not loud, not dramatic—just there.