Basic Trope: Singing as a sign of insanity in a non-musical work.
- Straight: No one sings in Tales of Troperia before Bob, having snapped after being unable to save his sister Alice, begins weepily singing her favorite ballad ad infinitum.
- Exaggerated: The only time any character in Tales of Troperia sings is after losing their minds or at least becoming mentally unstable.
- Downplayed: Bob begins weepily singing Alice's favorite ballad after failing to save her. He never fully recovers but over time becomes more functional.
- Justified: ???
- Inverted: When Bob begins to sing Alice's favorite ballad, it's a sign he's healing.
- Subverted: ???
- Double Subverted: ???
- Zig-Zagged: Tales of Troperia is a non-musical work. Bob weepily singing his dead sister Alice's favorite ballad incessantly is a sign that he's snapped; Charlie singing a ballad during the Darkest Hour is encouraging; young orphan Eva singing a silly kid's song has nothing to do with sanity either way.
- Parodied: Even a child singing "Mary Had a Little Lamb" is considered a sign of insanity.
- Averted: Nobody, sane or insane, sings in Tales of Troperia at all.
- Enforced: Initially, Bob's insanity isn't indicated by a song, but the original test audiences didn't understand the Thousand-Yard Stare and the producers insist on another sign to indicate that Bob has gone off the deep end.
- Lampshaded: ???
- Invoked: ???
- Exploited: An assassin, sent by Emperor Evulz to kill Bob, can track him easily by following the "singing."
- Defied: ???
- Discussed: ???
- Conversed: ???
- Implied: Charlie comes out of a room where Bob is weepily singing Alice's favorite ballad. He asks Dracone if he could ride to the sanatorium and have them send a cart back.
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