I just moved into a dutch student house without any grounded plugs which is quite usual around here. I get the 'Macbook Tingle' after some time, which solved by nudging the Macbook to the Radiator. and now I'm about to connect more computer appliances to an extension cord.
This makes me wonder: Can I earth the entire extension cord/ power strip with a crocodile clip to the radiator? Of course securing both sides properly. Needless to say I know this is not ideal but I'm also not keen on leaving it without anything.