How can I avoid my MacBook Pro giving me minor shocks?
What's fascinating to me about this phenomenon is that you can actually <i>feel</i> the 60Hz AC by running your hand across the lid.<p>It feels as if the surface is slightly bumpy, but the width of the bumps changes as you adjust the speed your finger moves.<p>Unplug from mains, and the surface becomes smooth.<p>As the answer notes, this only happens when using the two-prong adapter without earthing. It also seems to be more noticeable when connected to older buildings.