A rabbi used to go around wishing everyone a kosher Purim and a happy Passover. Someone stopped him and said, What are you, crazy? Don’t you have it backward?
The rabbi shook it off. “Not at all,” he said. “On Purim, everyone is very concerned about being happy, so they make sure to do it. And on Passover, everyone’s worried about cleaning their houses and getting rid of their hametz, so they make sure to do that. But on Purim, with all the happiness, people sometimes need to remember to keep it kosher. And on Passover, when everyone’s stressed out, they need to remember to keep it happy.”