slight shock, not static
i have a recently purchased mbp, and consistently get slight shocks from the edge when the laptop is plugged into a power source and my lower arms are moist (e.g. from hot summer weather). i've seen some replies to postings like this one which mention static, but in my case that's not it: if it were static, then one discharge would do the trick. this is constant sharp tickling. i've measured 100v steady charge between keyboard cover and ground, and suspect that my laptop has an insufficiently insulated connection somewhere inside, relatively harmless since it doesn't affect the functioning of the laptop, at least not yet. i'll take it in to be tested at the next opportunity, but would be interested to hear if someone has a more useful comment than static or an ungrounded wall connection.