Matzo is bad enough, but manna was apparently worse
As a natural food substance, the consumption of manna would produce waste products; but in classical rabbinical literature, as a supernatural substance, it was argued that manna produced no waste, resulting in no defecation among the Israelites until several decades later, when the manna had ceased to fall.[46] According to modern medical science, the lack of defecation over such a long period of time would cause extremely severe bowel problems, especially when other food later began to be consumed again; the classical rabbinical writers argue that the Israelites complained about the lack of defecation, and were concerned about potential bowel problems.[47]
[From Manna - Wikipedia, the free encyclopedia]
There's potty humor, and then there's religious potty humor.
