WAYLAND, NY—While eating lunch at the Back Porch Cafe Monday, a suspicious Diane Rollo, 43, sought confirmation from her lunch companions that the beverage in her glass was regular Coke and not diet. "Does this taste like diet to you?" asked Rollo, who ordered a Diet Coke, before handing the drink to Liz Lauderdorf. "This tastes like regular to me." After passing the drink to two other people at the table for sampling, Rollo said she was "70 percent sure" the soda was regular and sent it back.