You see, goldfish are actually highly intelligent animals capable of being trained to perform all sorts of tricks. Problem is, it takes at least two weeks for their brains to fully mature and 99.5% of goldfish never live that long.
Ha, I'm just kidding. Goldfish suck. This video was totally 'Shopped… or those fish ate magnets and the guy is holding magnets in his hands… or he's using some sort of Final Fantasy spell on them… or something. I don't know.
I will say, however, that in the realm of special powers, the power to control goldfish is about as low as it comes.