Most everyone in the English speaking world knows about limericks, and many people know about haiku, but another entertaining poem, though much less well known, is the clerihew.
According to the above link, the rules for writing a clerihew are:
1. They are four lines long.
2. The first and second lines rhyme with each other, and the third and fourth lines rhyme with each other.
3. The first line names a person, and the second line ends with something that rhymes with the name of the person.
4. A clerihew should be funny.
It lists a couple examples, one of which I'll supply here:
Their music hurts my ears
I much prefer Britney Spears.
Let it be known that I personally don't like Britney Spears, either, but I suppose she is slightly superior to N'Sync, maybe...
Anyway, let me try my hand at one of these things on the eve of Rita's visit
useless as a Fiero
Took steroids for his hemorrhoids
They grew into asteroids.
(I'm under hurricane stress, you come up with a better one)