Haha, I'll let you find it.
I think that plugs in europe aren't earthed. All it means is that anything plugged in the adaptor isn't earthed, meaning if it breaks and shorts, it's not earthed so it might hurt you.
Similarly, in england some electrical goods come with a plastic prong for the earth prong. This means that they aren't earthed. This is usually because they're so low powered it won't damage you if it shorts out.