Hook Foot falls in love with a mermaid with ulterior motives.
This episode provides examples of:
- All Webbed Up: The fishmen have a twist on this with their coral grenades, which explode into coral that immobilizes anyone caught in the blast.
- Becoming the Mask: Originally Seraphina hits on Hook Foot and gives him a necklace to keep a stolen pearl off her hands until the heat dies down, but eventually she really falls for him.
- Beauty Equals Goodness: The evil-looking fishmen appear to be the villains at first, but are actually law enforcement officers that are trying to capture Seraphina for stealing a priceless artifact.
- Be Yourself: Rapunzel advises to Hook Foot to "just be yourself" when he is nervous about his date with Seraphina. It works, as they have a nice date and she really falls for him.
- Both Sides Have a Point: Deconstructed. Eugene admits that Rapunzel is right, that love sometimes has a way of happening on its own. While Rapunzel admits that Eugene is right, the love is something you need to work at somethimes.
- Destruction Equals Off-Switch: Subverted. Cassandra cuts a coral grenade in half and praises herself for seemingly disabling it, only for the halves to detonate anyway and capture Eugene and Lance.
- Does Not Like Shoes: When sitting on a picnic mat giving him dating tips, Rapunzel advises Hook Foot, "The important thing is that you're comfortable." She emphasizes her prefered state of comfort with her bare feet, and moves them gently in a cozy posture. Hook Foot, being handicapped, can't do the same.
- Explain, Explain... Oh, Crap!: Hook Foot when he's explains his "non-date" dinner with Seraphina.Hook Foot: No, it's not a date. We're just gettin' together to eat and, you know, uh, talk, and, uh....... Wait! I have a date!
- Heroic Sacrifice: Seraphina gives herself up to the fishmen so they will leave Hook Foot and his friends alone.
- Hostage for MacGuffin: As part of her Heroic Sacrifice, Seraphina threatens to destroy the stolen artifact if the fishmen don't agree to her terms.
- Shout-Out: The title of this episode is one to There's Something About Mary.
- Unusually Uninteresting Sight: Hook Foot doesn't mention his date is a mermaid. When Rapunzel makes a point of how unusual that is, Seraphina the mermaid points out that Rapunzel has 70 feet of hair.