I’ve heard this as a concept but have never seen any actual examples. The idea is that, in a monarchy where anyone that displeases the King/Queen can be executed, the court jester is the only one able to explore ideas that others are too afraid to touch. It makes sense that having humor as a tool, and being considered a “fool” so not having all of their words fully scrutinized, would allow them to speak more openly, but are there any documented examples of this happening?