Howto stop a MacBook Pro from short-circuiting you

My girlfriend has read somewhere (I don't know where exactly) that the very light but very annoying short-circuits you get from the metallic case of a MacBook Pro sold in Europe is due to a failure of Apple's manufacturer to connect the earth (wire) inside the european plug, so that electricity overcharge is not removed by any other means than your arm. Well, I just tried the recommended solution: replace the plug with another one (the original cannot be reassembled once disassembled), this time connecting the earth (wire) correctly. I'm happy to say this worked out very well, apparently.