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Insouciant Spell: a Curse?

There have been a lot of rumors that the insouciant spell is in fact a curse. As Transmermaid of Transmermaid.webs points out:

The insouciant spell does NOT work, never did, never will. It's a Tiny-curse. A prank spell if you will. Something to trick and incovenience. It's a spell that just causes 'side effects' as people started to call them. 
This is what I like to call a tiny-curse. A tiny-curse is an easy spell that brings you all kinds of physical aches; like sore joints, iciness, rashes, and so on. This spell will never make someone turn into a mermaid, and those who say otherwise are lying.

She's got me convinced. What do you think? Have you ever had any experiences with this spell?