Just for the record, a google search gives authorship of Boa Constrictor by a majority vote to the Scouting Association of America. But for other Shel Silverstein verse see http:"//www.rpi.edu/~nicej/poetry/others/shel.html"
In line with the tone of this thread is:

The Dragon of Grindly Grun

I'm the Dragon of Grindly Grun,
I breath fire as hot as the sun.
When a knight comes to fight
I just toast him on sight,
Like a hot crispy cinnamon bun.

When I see a fair damsel go by,
I just sigh a fiery sigh,
And she's baked like a 'tater-
I think of her later
With a romantic tear in my eye.

I'm the Dragon of Grindly Grun,
But my lunches aren't very much fun,
For I like my damsels medium rare,
And they always come out well done.



Rod Ward