This funny song about how to write limericks... is partly a limerick itself !
Nick, from the 'Imagine Learning English' software indicates you the steps to write a great limerick :
Writing a limerick : 9 steps
#1 Know the basic characteristics of a limerick :
A limerick contains five lines. In this mini-poem, the first, second, and fifth lines rhyme, and the third and fourth lines rhyme.
#2 Choose the ending of your first line, usually a geographical place.
#3 Think of lots of different things to rhyme with your first line ending.
#4 Make associations with the rhyme words.
#5 Pick a story that appeals to you, and decide on who the person(s) is you introduce in line.
#6 Make the first line nice and fitting with the meter.
#7 Choose a situation or action in which your person starts off.
#8 Think of a 'turn' or 'twist' in your story, while considering rhyme words for the 3rd and 4th line, but save the punchline for your last line.
#9 Go back to your list of rhyme words and find a nice one to wrap up the story with a punchline.
Where does the word 'Limerick' come from ?
It derives from Limerick, an Irish town. Apparently a pub song, or tavern chorus based on the refrain "Will you come up to Limerick ?" where such bawdy songs or 'limericks' were sung...