When Adar arrives, we increase in Simcha.

Sefer Yetzira reveals that Adar has to do with the concept of sechok - laughter.

A good joke is when the story was going one way and unexpectedly it flips around - that elicits strong laughter.

The ultimate laughter is when the world looks like it is going one way and then it turns on its head - that will bring us to a state of laughter.

Our Sages teach us that it's forbidden to fill our hearts with laughter in this world- only in the world to come. Only then will we understand that all the things in the world that liked like they had to come to an end, we're really being reborn to a brand new level of existence.

Just like a seed falls apart in order to sprout a tree, so too our body goes into the ground to be able to be resurrected in a most pure and holy fashion.

Haman mistakenly thought that Adar was our weak point because Moshe died. He didn't realize that Moshe was also born in the month of Adar. The depth being conveyed here is that his death in itself was an act of rebirth.

Nothing in Judaism ever dies. Whatever looks like it came to an end, is looped in a circle and connected to a new beginning.

This is the true joke of our existence in this world.