Passover is a little less than a month away. Humorist Alan Zweibel grew up attending his share of Seders, and he joins us for a lighthearted look at the rituals that surround the holiday. His new book, which he co-wrote with Dave Barry and Adam Mansbach, is called “For This We Left Egypt?: A Passover Haggadah for Jews and Those Who Love Them” (Flatiron Books).