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.

Hi Casper-Tech
I am also the owner of the new retina display macbook pro and just few days after the purchase, i realised that it passes me electricity shock whenever I glide my fingers on the aluminium chasis body, especially the metal next to where we plug in out power (below the screen).
This happens when I use the 3 pin plug directly to the magsafe 2 whilts this problem is gone when I use the extension cable.
I have contacted Apple Care and they also said that this EXTREMELY WEIRD phenomenon is normal with the 3 pin plug as there is no grounding on the plug while the extension cable does have it.
I also realised that there is a difference between the 3 pin plug and extension cable, the latter has 0.5 A less fuse compared to the extension cable. Maybe this has caused the leakage of the electric current.
Meanwhile, I just intend to bring the machine and the plug to Apple Service Centre to have it look at and check whether there is a damage on my macbook pro.
If you feel unsatisfied/uncomfortable with this issue, you can get yourself a 3 pin plug with higher fuse rating or you can ask for a refund. That was what the Genius Bar suggested me.
Cheers. I bet there are many people with this problem but they just don't realise it yet.

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