From infancy laughter is a right-brain-to-right-brain attachment behavior mutually aroused and regulated within the caregiver–infant partnership. Laughter continues to be attachment behavior throughout life with potential for enhancing attachment bonds or for defending against them. Laughter in psychotherapy has primarily been viewed as a discharge phenomena with typical interpretations focused on the humor that elicits the laughter rather than the meaning of the behavior itself. Viewing laughter as attachment behavior in psychotherapy provides the clinician with valuable insight about its meaning and management within the therapeutic relationship.