Fidget spinners and Beyblades are deeply linked to reincarnation.

So there's this karma system and if you do good, you get points, whereas if you do bad, you get points deducted. What you reincarnate into after you die will be based on how many points you got.

So: If you get above 9000, which is high above the average, you become a Beyblade.

If you get below 9000, you become a fidget spinner.

[My (shoddy) research paper on this] (http://imgur.com/8MShnF2)