(Fisherman on a boat hooks a mermaid)
Fisherman: Yes! A mermaid!
Mermaid: This hook hurts!
Fisherman: Ooh, now give me my three wishes!
Mermaid: The hell are you talking about? There's a hook in my face!
Fisherman: You mean, mermaids don't grant wishes?
Mermaid: That's Genies, you ass!
Fisherman: Oh, man! I've wasted the last twenty years of my life! (shoots himself in the head)
Mermaid: However, I happen to be a Genie who only looks like a mermaid!
M. Night Shyamalan: What a twist!