I'm gonna head to the river

I went to the Apple store yesterday because my shuffle stopped working. "I always break Apple products," I told the genius behind the bar, "I went through two real iPods and will never buy one again. I go through laptops like that, too. But if this shuffle is broken I'm tossing it in the garbage on  my way out and that's the last Steve Jobs will ever hear from me," I threatened. I handed over the shuffle. 

He plugged in a pair of earphones and began bopping his head. 

"Of course it works for you," I said, "It'll stop working the second I cross the general walking space threshold. How'd you fix it?" I asked. 

"I turned up the volume."