Why would you do that?

I came across this reference to a Swiss site with pictures for making things out of everyday objects. There is no English translation on the site, but the pictures are enough to figure out what's going on, in most cases. Most are very ingenious. A few are a bit puzzling, not so much as to how they did it, but rather, why one would want to do it in the first place.

But, the last one, I don't know what to say. I don't speak German (I think that's the site language), but you don't have to. The picture says it all. That's just wrong.