...something fishy as you see your legs bind together and fell your "little friend" shrink in size and disappear within your big "leg". You ask what's going on and the dancer says: "You, my little fella, are going to be a fulltime mermaid" with a grin on her face.
When the final word landed on your ears, you look down and see your future fish-tail form while change color from "human color" (Beige(PLZ excuse my spelling)) to a mix of blue and green. Suddenly you passed out.
When you woke up, you are under water while you felt a terrible headace. When the pain killed itself, you saw you were a naked mermaid when...