[Updated] A mermaid in a dazzling, fringed bikini strutting across the stage with a pearl-bearing oyster above her flowing locks of seaweed. Behind her she's dragging a caged, pompous mortal in a slick suit. No, this isn’t Disney gone awry, it’s the Krewe of Mystic Orphans and Misfits' Annual Halloween Ball. The couple, dressed as a peeved mermaid and a BP Executive, won last year’s costume contest, calling their live artwork “The Mermaid’s Revenge.” The two were awarded a on...