Limericks are a humorous form of poetry made up of five lines and are generally just nonsense. The first, second, and fifth lines rhyme with each other and the third and fourth lines rhyme with each other. The third and fourth lines are generally shorter than the other three. Limericks were made famous by a man named Edward Lear, who wrote 212 of them. However, Lear didn't use the term limericks at all; the first usage was documented in 1898. The content of limericks are not always safe; their topics often dip into the more inappropriate subjects, however, they are quite fun and easy to remember.

There Was a Young Lady of Hull

There was a Young Lady of Hull,
Who was chased by a virulent bull;
But she seized on a spade,
And called out, 'Who's afraid?'
Which distracted that virulent bull.

~Edward Lear