Mermaids have a lot to fear. They're constantly hunted by sailors and fishermen, who are looking to make a quick buck off their tails. And let's not forget the sharks. Mermaids have to be careful of them, too. But what do mermaids really fear the most? It's not the hunters or the sharks. It's something much more simple: getting their tails wet. You see, when a mermaid gets her tail wet, she starts to transform into a human. And for many mermaids, that's a fate worse than death. They'd rather stay in the ocean, where they're free to swim and play. So next time you see a mermaid, be sure to give her a wide berth.