A Mysterious Turn

I was strolling along the stone patio away from that obnoxious tall grass when I spotted a bright brass knob stuck to a metal spigot. It looked suspiciously like a giant dial waiting to be bossed around! I marched right up, grabbed the ridged edge with both little hands, and threw my entire body weight to twist it. It groaned and barely budged half an inch, but a single fat drop of cool water plunked down right next to my foot! I let out a startled squeak, hopped back, and puffed out my cheeks. Don't you dare splash me! I planted my feet right by the puddle, crossing my arms to watch it strictly.