In the "Disney Jr.'s Ariel" episode "La Sirenusca" Lucia tells a scary story about a fish monster named La Sirenusca, and Flounder is so affected by it that he thinks he sees the real monster out in the ocean. Lucia, Fernie and then Ariel soon believe Flounder, and they head out to find the monster while singing this dancey-with-spooky-undertones song.
Lucia:
She's a mystery monster yeah
She could have pointy teeth
She might be red as a lobster
And likes blue and yellow treats
Fernie:
She might hide in the shadow
Just waiting to sneak up
A new fish to encounter yeah
We might just be in luck
Lucia, Fernie, Ariel:
La Sirenusca
La Sirenusca
Ariel:
'Cause some stories are pretend
And some stories are true
But you don't have to worry
'Cause she's not coming for you
Lucia, Fernie, Ariel:
La Sirenusca
Ariel:
She's just made up
She's not coming for you
Flounder:
I hope she never gets me
Hurry, hide me in the sand
Ariel:
We'll never let that happen
Besides she's just pretend
Lucia, Fernie, Ariel:
La Sirenusca
La Sirenusca
Ariel:
Wait!
Some stories are pretend
But maybe this one's true
I think I just saw her
Maybe I believe you