There isn't a lot of humour we have come across so far, in the water sector. Here is something though, from WASSAN (www.wassan.org) WASSAN has a set of cartoons on their site, based on their watershed project experiences.  The full set of cartoons can be seen here: https://www.wassan.org/gallery/pro_toons.htm One of them is shown below (click for fullsize image)