A Limerick has 5 lines and it has rhyming words. The first, second and fifth lines rhyme with each other. 3rd and 4th lines rhyme with each other (line 3) fog (line 4) bog. Limericks have a bouncy and fun rhythm which is caused by the rhyming. Limericks have line schemes (AABBA) which show that the lines with A rhyme and the line with B rhyme.