What is the metaphor of Batman's fatal joke?

When you get a glimpse of the essence of the rules of the game in contemporary human society-some people drink painkillers and some people crash and burn money.

Clown and Batman, the two lunatics, are all lunatics who have been treated in madhouses and domesticated in captivity.

My personal understanding is that the madman who jumped last is the clown and Batman who didn't jump last. According to the clown's logic, the essence of the world is absolute freedom, nothingness and disorder (just like the entropy increase of the fate of the universe), so he wants to escape from the controlled madhouse and embrace the pure world; Batman stays in the madness of order and is unwilling to take a step of "liberation".

Clowns try to guide Gordon and Batman out of their souls bound by lies. The light of a flashlight has a biblical metaphor. God said, let there be light. The clown is like a preacher in the new world, but his light is not believed by Batman. He was afraid of the bright reality and that he would fall into the abyss, so he stayed in the stable darkness of the old world.

This joke is ironic, realistic, accurate and absurd. It not only has self-consistent logic, but also breaks Batman's reluctance to face and admit it. So the master smiled, too. It was sad, helpless and crazy.

Batman and the clown are two sides of the same coin. The same idealism and extremism are symbols of the spirit of resisting injustice and suffering. Just because of their different classes and origins, they chose two completely different ways of resistance-the establishment and destruction of order. Destruction is rebirth. Penrose's stepped structure is like a vivid interpretation of human history, and it is also the source of literary significance of Ugly Bat.