Japan has always been a master of WTF-ery, but then again that's just one of the many things we love about that place and her people - they just like to do things a little slanted than the rest of us.
Take watermelons for example. Most of the world knows them as oblong round fruits with yummy goodness inside. The Japanese, however, took one look at them and said, "Why does it always have to be round?"
Then, though trial and error, they did something about it.