Little Willie verse is a type of comic light verse built around a mischievous, unlucky boy named Willie. The poems usually use short quatrains, often with simple rhyme and a quick punch line, and they end by turning a childish situation into something darkly absurd or ironic.
The term is most often associated with short, joke-like poems in which Willie's pranks, accidents, or bad luck lead to an unexpected payoff.
Example
Little Willie climbed the garden wall
To see the apples from afar.
He found the fruit were out of reach,
So he invented gravity instead.