I long ago stopped using the two-prong adapters; they&#x27;re just a bad idea when you plug in at places that don&#x27;t have particularly clean power. Where I used to live, my unibody Macbook would literally give me a little static shock whenever I touched it as long as it was plugged in with the adapter (or possibly it was a continuous current; running your palm along the metal felt a bit like rubbing a balloon.)<p>Switching to the long 3-prong &quot;cable&quot; connector solved that, and I&#x27;ve never dared go back.