MistahBungle
100+ Head-Fier
Lock, put your music on, adjust the volume if you want with the screen on, hit the power button once to turn the screen off, chuck it in your pocket & you're all set - no accidental volume changes (not that these are a huge issue with the device given how little it changes with a full turn, but, anyways ) Fiddle with the volume knob once you've turned the screen off to satisfy your natural curiosity as to whether the lock actually really works or not if you want (I did )