I recently made a spell
That I didn't mean to make.
It was totally an accident,
An error, a flub, a mistake.
It was early in the morning,
And I was reading by myself,
Looking through a yellowed book
From a dusty old bookshelf.
I merely muttered some words.
I didn't know what they meant.
That's when I started to feel
That my back was curved and bent.
Don't ever say an unknown spell,
Or you may regret your mistake.
That's exactly what I did
When I turned myself into a snake.
Bruce Larkin
http://www.poemhunter.com/poem/unknown-spell/