This is just a random puzzling issue.
I recently went to work without my iPod headphones which I’ve been using with my HTC Desire to listen to music during work, so I tried some others I’d picked up over the summer courtesy of Continental Airlines.
For some reason when I put the headphones in the sound went all echoy and when I tried to fix it the tracks would randomly skip forwards, skip backwards and skip through tracks. I also noticed the headphones icon at the top included what looks to be a headset microphone.
Turns out I’m not the only one… users on Android Forums have been reporting the same issue. Very disappointing from a top-of-the-range Smartphone.