Beautiful though they may be, let's get one thing straight -- the world's oceans and rivers are basically giant, terrifying bottomless pits full of things that wants to eat you, like great white sharks and giant squid and sea lice as big as your fist. Considering how many things that live in the ocean should inspire fear in your heart, but if it's being bitten by something that scares you the most
-- and that is, in our estimation, utterly understandable -- then you should be most terrified of piranhas, which have a stronger bite, pound for pound, than any other fish in history.
On the bright side, though, you can be glad that the megapiranha, which is not just a C-minus movie monster but a variety of piranha that is pretty much exactly what it sounds like, is now extinct
and can no longer bite you. Thank God for small mercies, right?