This is the layout of a German keyboard:

When I first saw this, I thought, “Oh cool, it supports the ä, ö, ü, ß and the euro characters!”, and then I realized, that because of it, many of the other keys are in different places.  The most annoying change of all, is the switching of the z and y characters.  During work, I kept typing my name wrong.  As a result, I changed it to the North American keyboard and all was well again.