Worm, worm, worry­-wart
Wriggling underground.
What should worms be worried for,
Hiding safe and sound?

If it were not for just one thing
They’d all be happy fellows:
But here’s what really worries worms:
They haven’t any elbows.

Image “Earthworm” by Flickr user Pfly is published under an Attribution-ShareAlike 2.0 Generic (CC BY-SA 2.0) license.