"The Crabfish" is a ribald humorous folk song of English origin. It is one of the most widespread English-language folk songs, being found in almost every English-speaking country and still being sung to the present day. The oldest known mention is in the seventeenth century, appearing in Bishop Percy's Folio Manuscript as a song named "The Sea Crabb" based on an earlier tale. The moral of the story is that one should look in the chamber pot before using it.