Now, understand that anyone has heard of legends of Sirens. Sure, Fishmen existed. But Sirens were a whole other thing.
Creatures that sang of whatever someone desired. Money, love, fame. They'd drag their victims and drown them to death before eating them. That's how the stories usually went anyways.
Shanks had to admit... He never believed in such stories. Remembering the days Roger would talk of the Sirens. Who's to say it's not just a mermaid or merman?
Well... Till they accidentally caught one. Shanks watched as the creature sang. Watching as Yassop fell into a trance and almost let the creature free. He huffed and covered his ears while shouting.
"Everyone cover your ears! Don't let them trick you!"
Shanks looked around for something to keep his ears covered so he could help Yassop.