A clerihew is a whimsical, four-line biographical poem invented by Edmund Clerihew Bentley. The lines are comically irregular in length, and the rhymes, often contrived, are structured AABB.

Muhammad Ali
who stung like a mad bee
And floated like a butterfly;
then punched you in the eye.

Albert Ahearn

http://www.poemhunter.com/poem/muhammad-ali/