Events that change relational knowledge were investigated because they have theoretical implications for uncertainty reduction and relational cognition and they have important consequences in terms of personal trauma and relational damage. Data were gathered in ways that corrected major problems in earlier studies, results were compared between two studies, and hypotheses about differences were tested. Additional information was also gathered concerning how often such events occurred, what led up to them, attributions about causes, coping strategies, and how the experience was viewed in hindsight. The results indicated that although the emotional and cognitive effects of the events were nearly as strong as found in earlier studies, the effects on relationships were not as negative. Other findings and their implications for uncertainty reduction theory and existing models of schema change were also discussed.