I just checked my tires and I heard a slight hissing, I touched the valve on the rear tire and it just broke off, could have been ugly if I had been riding
Man that is so weird, this is the third time I've heard of this happening in a period of just a few months! Get yourself some aluminum angled valve stems. Not sure if these guys will ship to Oz, but for $9.99/each, worth a shot. Most places on the net seem to have them for $19 or more. They used to be $4.95 last year! http://www.nomartirechanger.com/category_s/34. Oh yeah, that is a spot of luck! Cheers.