You know how Apple wants you to buy their World Travel Adapters? Well, I was recently looking into the whole adapters world and, well, this little "hack" might save you a couple dozen dollars! Basically if you find yourself in a foreign country and the power socket is different, just go to the nearest "Dollar Store" and buy a KETTLE! :D
Why a kettle? Well, it can actually be any electrical appliance with an unpolarized C7 or C8 IEC connector (or the regular "appliance connector" as normal people call it). The next step is to stick the connector into your MacBook power brick and enjoy you DIY travel adapter.