Shocking situation MacBook Pro
One thing to consider is that if you are holding an aluminum MacPro, you are connected to the electrical ground in your home. Now, many electrical devices are double insulated from the power supply in the wall. They might have a plastic case, for example.
Apparently MacBook pros are not. So if you happen to touch some source of electricity accidentally, and are holding the MacBook pro, your body completes the circuit and gets zapped with 120 volts, or 240 in the UK or other countries.
I just got my MacBook Pro a couple days ago and was laying in bed. It's a cool day and I'm warmed by an electric blanket. I extend my leg and feel something on my toe, like a bug bite. This happens a couple times and then again, only with the full force of household 120 volt AC current, which I've felt a couple other times in my life.
I didn't really suspect the MacBook Pro, but have had the electric blanket for years and have had no problems. I used to have a White MacBook with a plastic case (non conductive) and had no problems with the blanket and the computer regarding electricity.
I suspected I was getting charged up by something in the blanket and the computer was the grounding source to complete the circuit, from my toes to my hands through the MacBook to the wall outlet. I was using the 2 prong plug in the charger.
There are plenty of household electrical problems, and double insulated electrical devices protect us from these problems. People sometimes wire lamps or other devices wrong, and the outside metal portions of the device become energized. Apparently, the MacBook Pro does not protect us from these wiring problems.
I've personally seen this several times. A frayed lamp cord contacted a metal lamp pole, energizing the pole. As a child I grabbed that lamp pole, and a metal post in our attic with the other hand. Instantly, power ran through my body, and I couldn't let go. Fortunately, my mother heard my cries and ran up the stairs and pulled me loose. Otherwise....
An photo enlarger I used to use at work was wired wrong, and I would feel power when I touched it and another grounded metal device.
I had problems with some photographic strobe lights, they kept flashing when they were not supposed to. I tested the circuit at the venue they were plugged into, and the tester said the homemade extension cord, a junction box with 4 outlets connected to an extension cord was wired incorrectly.
Another time I was in the bathtub, full of water. I touched the metal spigot with my toe and felt current, which I measured later with a meter and it was 120 volts. I don't remember why that happened.
I'll test this outlet also, but I'll bet there aren't any problems. The problem is the the macbook pro is aluminum, and by holding the macbook pro, you become part of an electrical circuit if you also contact something else that is an electrical source.
I may send the computer back, I'd rather be protected from stray electricity than be cool.