I would guess it has something to do with the current you have.
In Austria you have one pole of the line which delivers the power (230 Volts) and the other pole is discharging the power. In our country this one is grounded. In other countries it is not grounded but going back to the electricity board.
I found out that with the same laptop I have, using it in other countries it also happens to me sometimes that I get this electical feeling as well.