The ‘Last cookie rule’ is an unwritten but widely accepted social code that dictates the distribution of the last remaining cookie in a group setting. According to this rule, the last cookie should be offered to the person who has not yet had a chance to enjoy a cookie, rather than being claimed by the person who is quickest to grab it. This rule promotes fairness and consideration for others, ensuring that everyone gets a chance to indulge in the delicious treat. It also encourages sharing and generosity, as the person who receives the last cookie is often expected to offer a piece to others as a gesture of kindness. While not a formal rule, the ‘Last cookie rule’ is a simple yet powerful way to promote harmony and goodwill in any cookie-loving community.