One day Sorori came to Hideyoshi and said that there was a cucumber eating a cucumber. Hideyoshi did not believe him, and agreed to give him a reward if he could prove it. Sorori took Hideyoshi out and pointed to a man sitting by the side of the road eating something. Hideyoshi complained that he was just a man. Sorori said,“Look well. That man is a wood seller [きうり]. He has a bundle of firewood on his back, and he is eating a cucumber [きうり]. That's why I told you that a KIURI (wood seller) is eating a KIURI (cucumber).
Source： Salvatore Attardo's Encyclopedia of Humor Studies (2014)