I have an early 2011 13" MacBook Pro that only during charging gives me an electric shock to my arms when they come into contact with the front edges of the unibody enclosure during normal usage. I don't know how long this issue may have been going on for because I usually use it with an external monitor in a desktop setup and rarely use the built in keyboard. However I have brought it with me on holiday to Greece and during normal usage when charging it gives me a shock. Is it perhaps a dodgy greek electrical socket? I am using an official Apple charger with the official apple travel adapter kit for european sockets. Also when I lightly drag the back of my fingers over the area where the battery is during charging it gives me a vibration, but not when my fingers remain static, only during movement. I don't know if this is normal or not. However the shocking is very alarming and may be a serious issue. Has anybody heard of an issue like this before on any laptop, particularly MacBook Pro's? Is my battery faulty, or perhaps my charger? I would very much appreciate any help or suggestions, thank you.