In honour of St Patrick’s
Day we held an office Limerick contest!
You don’t need the luck of the Irish to be a good poet!
A limerick is a form of verse, often humorous and sometimes obscene, in five-line, predominantly anapesticmeter with a strict rhyme scheme of AABBA, in which the first, second and fifth line rhyme, while the third and fourth lines are shorter and share a different rhyme.  The following example is a limerick of unknown origin:
The limerick packs laughs anatomical Into space that is quite economical. But the good ones I've seen So seldom are clean And the clean ones so seldom are comical.
The form appeared in England in the early years of the 18th century.