A Dallas-based restaurateur is turning one of the biggest gag gifts of the early aughts— the singing plastic fish known as Big Mouth Billy Bass — into the signature design detail of his growing restaurant chain. At Flying Fish, a bar and grill with nine locations spread across three states, restaurateur Shannon Wynne will happily offer a basket of fried catfish in exchange for a Big Mouth Billy Bass donation. Before nailing them to the “adoption center” wall, employees remove the batteries from the fish, so that they don’t sing that Al Green song for all of eternity.