As human beings we are very social in nature and have a strong desire to belong or be accepted by others. Unfortunately however sometimes we are not accepted by others, and feel rejected or socially excluded. When this happens we may respond by trying to reconnect, but when reconnection is not an option we may act in ways that are antisocial or selfish. The literature has repeatedly shown that when individuals are socially excluded they respond with a variety of detrimental behaviors (e.g., less pro-social behavior). Although this effect is robust, we suspect that the way individuals are excluded is responsible for the negative behaviors documented. We therefore conducted a study to examine whether excluding someone for a specific reason, and in turn making that individual feel the emotion of guilt, would lead to more pro social behavior than excluding that individual for no reason. Results confirmed this hypothesis, such that participants donated more money to an organization when they were excluded with guilt or excluded for an external reason relative to if they were excluded for no reason. Discussion focuses on the relationship between guilt and exclusion from an evolutionary psychological perspective, and how these processes can lead to positive behavior.