Final answer:
The funniest thing about the shadow is that people mistake it for the real thing and treat it as such.
Step-by-step explanation:
The funniest thing about the shadow, according to the given texts, is that people mistake it for the real thing and treat it as such. In Plato's allegory of the cave, the prisoners think that the shadows on the wall are the real objects, and they even receive prizes for their accuracy. Similarly, in other texts, the shadow is described as something that changes and deceives our perception, causing confusion and misunderstanding.