If you have a new 4th-gen nano and a decent ear, you may have noticed something funny: After putting it to sleep, if you wake it up by inserting headphones, the left and right channels switch. I tried this with the most obvious stereo mix of all time, David Bowie's "Space Oddity," and it's really easy to duplicate yourself. While it's easy to correct, it's still definitely a weird, weird bug. Thanks to reader Matt for bringing it to our attention, and posting a thread at iLounge. Have you noticed it or any other weird glitches, like Genius' pathological avoidance of the lovely Norah Jones? (I'm serious, try it!)