An eight line verse I tried to write,
It kept me up near half the night.
Twas not so much the missing rhyme
More vexing was the metre’s time.
When in the end my pen laid flat,
the paper bin was bursting fat.
How sad the promise of that verse
became instead an evil curse.

Sailing to windward

http://www.poemhunter.com/poem/eight-line-curse/