John Fuller, in response to a competition challenge, set out to write a poem consisting only of three-letter words. And in order to add to the interest, he decided on a form in which there were three three-letter words per line, and the lines came in groups of three. The resultant poem is beautiful, but it is the only beautiful poem in this form. It is called "The Kiss":

Who are you,
You who may
Die one day,

Who saw the
Fat bee and
The owl fly

And the sad
Ivy put out
One sly arm?

My best humorous poem using a similar style is:

PAY

DAY

And it brings a smile, at least to the recipient

Amitié, Rolland