Why is it that every now and then my ear bud will shock me out of nowhere? I'm just listening to music minding my own business when all of a sudden ZA..ZZ...ZAAA..ZAP!! It's feels like a static shock one would get from a finger except it comes from the earbud. The only thing I can think of is that my Blackberry may be interfering with it somehow and inducing the shock, but besides that I don't know? Does anyone have any clues?