Current leakage/electric shock while charging
I just own the Macbook Pro Retina Display for a few days and everytime I'm trying to charge it with the supplied charger, the metal casing has feel of electrical shock! I encountered this at all location regardless of power sources, from various countries in hotel and at home.
If I use the power plug adapter that has 3 pins adapter with extension cable, it will eliminate the problem as it has ground contact on the adapter. However, the 3 pins or 2 pins adapter that direct attach to the power adapter without extension cable does not come with ground contact. I would not want to bring the extension cable everywhere.
I approached Genius Bar but was told that it is normal. I couldn't accept the answer as this "normal" condition is greatly impacting Apple product user experience! I'm ok if Apple could replace my 3 pins adapter with a grounded pin and stay with the problem with 2 pins but not asking me to accept the fact that "it is like that, we can't do anything" or a defective product.
MacBook Pro with Retina display, OS X Mountain Lion (10.8.2)