How can I avoid my MacBook Pro giving me minor shocks?
What's fascinating to me about this phenomenon is that you can actually feel the 60Hz AC by running your hand across the lid.It feels as if the surface is slightly bumpy, but the width of the bumps changes as you adjust the speed your finger moves.Unplug from mains, and the surface becomes smooth.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.