A limerick is a five-line poem written with one couplet and one triplet. If a couplet is a two-line rhymed poem, then a triplet would be a three-line rhymed poem. The rhyme pattern is a a b b a with lines 1, 2 and 5 containing 3 beats and rhyming, and lines 3 and 4 having two beats and rhyming. Some people say that the limerick was invented by soldiers returning from France to the Irish town of Limerick in the 1700's.
There once was a girl named Sherry.
Who ate spiders which is really scary.
But the spiders didn't mind,
To be devoured each time.
They were just glad to keep her so merry.
As they walked along the shore,
they picked up more and more
The beach became their test,
the vacationers came to rest.
Seashells on the shore.