I've had this on two MacBook Pros here in Australia. On the first one I took it in to a Genius Bar appointment and, while they acknowledged it happens to a "rare number of people", they basically said tough luck and to use the earthed power cable which is about 1.5m longer. By the second time I just accepted it as part of owning a MBP.

As an aside, I should buy a lottery ticket given the number of rare issues that happen to my Apple products.