A limerick is a short, humorous, nonsense poem especially one in five-line anapestic meter with a strict rhyme scheme (AABBA), which is sometimes obscene with humorous intent. The first two lines rhyme with the last line and the third and fourth line rhyme, and they are usually shorter. The form can be found in England as of the early years of the 18th century. It was popularized by Edward Lear in the 19th century, although he did not use the term.
Felipe The Fish
I once heard of a young fish named,Felipe
Who floated up to consider a leap
His friends did shout
For him to jump out
But he was afraid the air was too deep