The quote "Nuts don't come in bunches. Only grapes do." from the book "Shock Wave" by John Sandford conveys a metaphorical idea about individuality and the uniqueness of people or things. It suggests that just as grapes grow in clusters, certain elements may often be grouped together, while others, like nuts, stand alone. This distinction could reflect the complexity of human relationships or situations, emphasizing that not everything can be categorized neatly.