Listen to the audio of video programs on your iPhone

Being a fan of Top Chef, its one of the subscriptions I've purchased from iTunes this season. It's one of those shows that can be followed without actually watching and often that's what I do at my desk. By accident tonight, I figured out how to do this on my iPhone, so I could safely slip the phone in my pocket and listen to the show as I washed some dishes. Its very simple:

1. with the iPhone's ear buds connected, start the video
   
2. hit the power button once, putting it into sleep mode
3. hit the power button again to display the "slide to unlock" message
4. click the button on the in-line mic on the ear buds once

The audio of then show should start playing. At any time you can click then button on the mic to stop and start the audio, and if you turn on the iPhone and unlock it, you'll see the video continue on.