Headphone, Jack!

This seems like an incredibly simple problem to fix: You're listening to your iPod. And you're walking. You pull your 'pod out of your pocket, by the cord, because it's the only part sticking out. Your iPod comes out, but your headphones get pulled out. Maybe not all the way out, but enough to mess up your song. So here's my idea- how about if the headphones have little tabs, or just one tab, on the end. To visualize-You put your headphones in the plug-in vertically. The tab is on the side of the part that goes in the plug-in. it goes in vertically too. But it only goes in if the 'phones are rotated to the right place, because your iPod has one little slot for the tab. Once in, you rotate your 'phones a bit, and no matter how hard you pull, they won't come out 'till you rotate 'em. Brilliant! Please tell me if this is already done-I don't actually own an Apple iPod brand mp3 player. But it could work for anything with headphones, and if the tab became standard, you could buy a new set of 'phones and still have this feature.