I was using the three pronged charger and the problem occurred. I switched to the two prong charger and the problem stopped.
The electrician opened up the wall sockets and made sure the earthing wire was in the correct position. Now i can use both chargers with no problems whatsoever. BTW, i wasn't wearing shoes when it occurred.
With the advancements in Apples designs, i'm looking forward to the next models.
I have the same problem, it's luckily more if a tingling, but still irritating... Only happens some random times. I got my multimeter and checked it, sure enough there was 220 volts running from the MBP to me. In addition to that I got as high as 0.2 ampere sometimes. 😱
Still, no biggie issue to me, more of a funny little thing.