Theory: the old man, when tasting the turtle soup, remembered the time when he was stranded on an island alone, with his only companion being a turtle he found one morning. Being on that island for so long, he went crazy with hunger and ate his friend, the turtle.
After a while he was rescued by a ship and years later, when he tried tasting a turtle soup in a restaurant by the beach, he was reminded of the friend he murdered and consumed, thus killing himself for he could not handle the guilty memories
Theory: the old man, when tasting the turtle soup, remembered the time when he was stranded on an island alone, with his only companion being a turtle he found one morning. Being on that island for so long, he went crazy with hunger and ate his friend, the turtle.
After a while he was rescued by a ship and years later, when he tried tasting a turtle soup in a restaurant by the beach, he was reminded of the friend he murdered and consumed, thus killing himself for he could not handle the guilty memories