Senryu (川柳) is a Japanese form of poetry similar to haiku in construction: three lines with a syllable pattern of 5-7-5. However senryu tend to be about human foibles while haiku tend to be about nature. Senryu do not need to include a season word like haiku. Much modern haiku is more similar to senryu than traditional haiku.
Paul H. Henry has called for the deprecation of humorous senryu in the English language in favor of the limerick.