If you google "laptop tingling" most of the cases of which users are feeling a tingling sensation when the laptop is plugged in.

Mine however, the G501JW, is the other way round. When left unplugged there is a tingling touch to every metal part, but when it is plugged in with the charger, the tingling effect is gone.

I can't tell if it is completely normal or not, since I always use an external keyboard and a gaming mouse. Well.. until recently I decided to unplug my laptop to wipe off some dust, then I noticed it.

I'm pretty sure it is a grounding issue but is it dangerous?