To be clear, if you've got the two-prong plugs used in the US and China, or the bulky three-prong affair for the UK and Hong Kong, you're alright. It's just the long, round-pronged adapters mostly seen in Europe and the angled prongs used in Australia that you need to be on the lookout for. Assuming you do fall into the former camp, check your plug adapter for "either four or five characters or no characters on the inside slot where it attaches to the main Apple power adapter."

If you've got those telltale characters, you'll be able to visit an Apple Store for a replacement, or request one online.