I experienced this recently, and switched to using the grounded charger. The tip of the charger that connects to the laptop the whole metal part, not just the

I experienced this recently, and switched to using the grounded charger. The tip of the charger that connects to the laptop the whole metal part, not just the leads) was quite noticeably electrified, while the laptop case only barely. I'm not sure what the cause was in this particular case, as I had never noticed it doing that before.