I've been trying to break these since I received my first pair to see how strong they are. I've fallen asleep and woke up tangled up in them, I've used them as nunchucks and swung them againest the wall till the screens flew out. I let my cats play with them. I always pull them out of the jack by the wire. Ive stripped all the fake screws trying to open them up. One side has a big gouge in it from me trying to open them up by the top. As hard as I tried to open them, I'm surprised I didn't crack the shell. Besides the missing screens, the only negative effect so far is these odd loops that cant be fixed.
i noticed this happens to my 8320s as well right where the cable exits the earpiece, its annoying but i guess if it doesn't short out its okay =)