Electrical buzzing on MacBook Pro case when plugged in

Figured out what was "wrong". The EMI filters leak current onto the case. If you use the 2-prong plug on the charger there is not a ground to remove the leakage current. So you can become the ground. You also act as a capacitor to ground when you touch the case, and this extra capacitance from you add increases the leakage current. The currents are low, from between 5-50 microamps. I also measured voltages up to 46V. This is all at 60 hz. But the weird thing is that you only feel a buzzing sensation when you are moving your fingers on the textured part of the case surface. If you stop or move over the smooth apple logo on the top of the lid you cannot feel it. I also tested this out on two other new MacBooks Pros in the apple store with the same effect. The apple tech also felt the same thing so it's just not me. I tried it on a MacBook Air and got nothing. I see this more as a nuisance if I'm working on my laptop and I feel this constant buzzing on my hands as they rest on the case as I type on the keyboard. The simple solutions are either 1) Use the 3-prong cable to your charger so the case now has a good ground 2) Wear shoes so you are not grounded, assuming your floor is a good ground or 3) Don't work on it while its plugged into a 2-prong charger.