"Lovely" by Jon Scieszka
I think that I ain't never seen
A poem ugly as a spleen.
A poem that could make you shiver,
Like 3.5 ... pounds of liver.
A poem to make you lose your lunch,
Tie your intestines in a bunch.
A poem all gray, wet, and swollen,
Like a stomach or a colon.
Something like your kidney, lung,
Pancreas, bladder, even tongue.
Why your turning green, good buddy?
It's just human body study.
2004. SCIENCE VERSE. Illustrated by: Lane Smith. New York: Viking. ISBN: 0670910570.