i don't understand why everytime i charge my mbp, i get this electric shocks. seems static electricity builds up that it actually zaps me!

i got this 15" laptop october last year and just a month ago, i tend to notice this hissing sound probably coming from the fan.

i searched the net for such experiences, and seems others, if not all, have same observations, even worse than mine.

a suggestion was to upgrade the firmware. i did, but didn't improve.

anyone having this predicament too?

TIA