Every time I touch my mbp near where my arms rest, my MBP is shocking me quite painfully. and at the bottom.
Its not the machine giving you shocks. Your generating a large amount of static. When you touch it the static discharges to the MBP from your body.
This is continuous painful electrocution. It's a very sharp pain. Doesn't matter if I'm plugged in or not, though its stronger if I am plugged in. So more like a i just stuck forks in the wall outlet. (which I did when I was real young...)