"Enuresis risoria" or "giggle incontinence" is a particular condition characterized by a sudden, involuntary, uncontrollable and complete emptying of the bladder during giggling or hearty laughter. We had under observation a 15-year-old girl affected by this condition. The tests she underwent did not reveal anatomic or functional alterations. We were able to control her symptoms with Imipramine. We can thus assume that laughter reacts as a trigger that activates micturition reflex through the intermediation of the limbic system.