Oh, so many contributions I have failed to make! First, up by the Edgar A. Guest submission, I should have added my suband's favorite:

I'd rather flunk my Wasserman test
Than listen to a poem by Edgar A. Guest.


Here's an old favorite from my childhood:

I shot an arrow in the air.
It fell to earth I know not where.
I lose more damned arrows that way!



And another, from G.K. Chesterton:

TRIOLET

I wish I were a jelly fish
That cannot fall downstairs;
Of all the things I wish to wish
I wish I were a jellyfish
That hasn't any cares
And doesn't even have to wish
'I wish I were a jellyfish
That cannot fall downstairs.'