Why is the mermaid so dirty?
Because she is a maid, mer-maid!
Why is the mermaid so dirty?
Because she is a maid, mer-maid!
Listen up, genius. The joke is a pun, see? A "mermaid" sounds like "mer-maid," which is a maid who lives in the sea. And maids clean, so a dirty mermaid is unexpected and funny... because you wouldn't get it otherwise, you baby sharky.