Basic Trope: Visual metaphor for arousal.
- Straight: Bob is sexually attracted to Alice, and when he sees her, his usually curly Idiot Hair stands upright.
- Exaggerated: Bob is sexually attracted to Alice, and when he sees her, not only his idiot hair stands up, a volcano erupts in the background, the Leaning Tower of Pisa stands back upright, and a flower suddenly blooms next to him.
- Downplayed: Bob is sexually attracted to Alice. When he sees her, his smile turns into a full-blown grin.
- Justified:
- Bob is a robot that cannot display emotions like humans do; his idiot hair serves this function.
- Bob's hair is prehensile, and it also reacts to his current emotions... including sexual arousal.
- Inverted:
- Bob sees Alice and is so repulsed his idiot hair forms a zig-zagging pattern.
- Footage of arousal is shown as a metaphor of curly hair turning straight.
- Bob's usually-upright hair suddenly droops downwards to serve as a visual metaphor for The Loins Sleep Tonight.
- Parodied:
- Pinocchio Nose, but reacting to sexual arousal instead.
- Bob's Idiot Hair randomly stands straight up in an inappropriate moment.
- Subverted: Bob sees Alice, his idiot hair stands upright... but it's just the wind making his hair stand up.
- Double Subverted: Then a flower blooms next to him.
- Zig-Zagged: ???
- Lampshaded: "Wow, Bob, is your hair some sort of desire sensor or what?"
- Averted:
- Bob sees the sexually-attractive Alice, and he sprouts a boner in his pants.
- No Hugging, No Kissing
- Enforced: "It's a kid's show, but we want to appeal to a wider audience - that trick will definitely be a good Parental Bonus !"
- Invoked: An evil witch curses Bob's erectile functions to migrate to his idiot hair.
- Exploited:
- Alice uses the reaction of Bob's hair to gauge how sexy she is.
- In the case of the "flower bloom" erection, Bob uses his arousal to populate an entire garden.
- Discussed: "Ooh, here comes Alice - now watch intently Bob's hair and how it's gonna react!"
- Conversed: "Well, I guess that's a way to convey sexual arousal in a safe for work manner..."
- Deconstructed: Bob has erectile dysfunction, and this is the only way he found to convey sexual arousal.
- Reconstructed: It's soon recognized as an uncanny talent, and Bob becomes famous for it.
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