Acutally, there are (or rather were) natural fission reactions, so that's another way of natural element transmutation. About two billion years ago, the concentration of natural Uranium was about 3% U235 (compared to 0.7% today), so a sustained reaction could occur if the conditions were just right. The only known example of this is in Gabon, but scientists estimate that the reactors were running for a few hundred thousand years.

FTFA: 'Still, Judge Fogel said he had "considerable doubt that Lenz will be able to prove that Universal acted with subjective bad faith" when it sent YouTube the takedown notice.' If I were a betting man (and I am), I'd bet Universal wins this one.