The website "Neuroscience for Kids" is having a poetry contest, and all high school entries must be in the form of a limerick. Per the instructions: A limerick has 5 lines; lines one, two and five rhyme with each other and have the same number of syllables; lines three and four rhyme with each other and have the same number of syllables.
Here's a limerick
My AP psych class is so very awesome
Sometimes, though, my students play possum
Do your best on this poem
You'll be like the emperor in Rome
Use your brains, and your smarts and you'll boss em
OK, it's not a great limerick and it's not about neuroscience, really... but you get the idea.
Here's another one that is about neuroscience, but might not qualify...
There once was a psych class from North-Grand
Knew right motor cortex moves left hand
They could read MRIs
Recite parts of their eyes
But their anterograde amnesia made them forget the beginning of this poem
You can read lots of examples of truly clever limericks at http://www.thehypertexts.com/The%20Best%20Limericks%20of%20All%20Time.htm
The full entry rules are at https://faculty.washington.edu/chudler/contest16.html
The entries must be mailed by January 22 (this is a hard-copy, snail-mail contest.)