Bird People: The siren turns into a huge humanoid bird with bat-like wings.
Human Popsicle: Rolf trapped the siren inside an iceberg for 50 years until a couple of fishermen accidentally broke the ice, setting her free.
I Was Quite the Looker: Rolf the crazy old sailor used to be pretty good looking fifty years ago.
Logical Weakness: Just like in Greek mythology, Diana plugs Martin and Java's ears so they aren't affected again by the siren's song, although Diana uses chewing gum rather than wax.
Our Sirens Are Different: As expected from a siren, her singing charms men, but it doesn't affect women.
Paper-Thin Disguise: Somehow the principal doesn't notice that Martin is disguised as a cheerleader, being completely fooled by Martin's invented backstory and fake german accent.
Schmuck Bait: Charmed by the siren's beauty, Martin accidentally wakes up the siren, who is none too pleased at the intruder in her nest.
Woman Scorned: Being abandoned by Rolf turned the siren vengeful and even more dangerous, and trapping her in an iceberg just sealed the deal. Even though Rolf apologizes for his past actions, it's too little, too late.
