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I mean I can't blame them. If I saw one for the first time, I would've thought it's a mermaid as well lol.

Yeah, it actually looks like a mermaid from the movies because I doubt if real mermaids exist. I've always thought mermaids to be a work of fiction and not as something which is real.

Mermaids don't exist. Those are indeed work of fiction. 4 months at the sea would make anyone see stuff that isn't real!