Understanding and updating beliefs on deeply engrained topics can take enormous efforts, but sometimes it can be so hard that the listener cannot even in principle accept the new reality. The listener is simply not ready, he lacks a vast background of reasoning leading to the new understanding.
What fact that you know is true but most people aren't ready to accept it?
By "you know is true" I really mean "you are very confident to be true".
Feel free to use a dummy account.
'Humor' is universal. It's the same kind of cognitive experience everywhere and every time it happens. This despite the fact that individual manifestations diverge wildly and even contradict. It's true even though every example of humor (meaning, a thing some observers find funny) is also a thing that other observers find not funny.