A very weird thing happened today -- I was watching a video in iTunes with the headphones at moderate volume (about 3/4 on the slider on the screen). A call came in, and when I accepted it, my friends voice was insanely loud in the headphones -- way, way, painfully louder than the video had been, louder than I realized the headphones could even go. I immediately turned the volume down, but now there is a definite sort of rattling/crunchy sound in the background in the left ear, triggered I think by high frequencies. If I plug in the headphones from my iPod the sound goes away, so it is definitely in the phones. I am assuming I won't have any trouble getting them swapped out by Apple (though I won't be surprised if the store does not have them in stock, and I will have to get them from Apple). But it is pretty alarming that this happened, and makes me afraid it could happen again with the replacements. Has anybody else experienced this, or seen any mention of it anywhere?