Dave Haydel of Haydel's Bakery announced plans to make the world's largest king cake on Sept. 22, encircling the Superdome -- twice."My brother and I were delusional during Mardi Gras" when they came up with the idea, he said.The family-owned bakery has hooked up with the New Orleans Saints for the event, which will go for a new Guinness World Record.