The notion of irrationality is not strictly speaking a psychoanalytic concept. Moving beyond the strict opposition between rational and irrational, while attempting instead to consider the possible transitions between these two notions, will allow us to avoid considering reason as the sole guide, or words as the sole language. A first situation taken from a film will serve as an introduction. We will then continue our journey in the clinical field to examine the richness offered by the emergence of irrationality in analytical work by considering first the situation of an exiled adolescent girl. Next, we will focus on highlighting the possible mobilization in analysis following an instance of acting out by the analyst. The concept of glitch will then be examined in a metaphorical sense. Listening to the emergence of irrationalty in analysis and being able to hear the irruptions of nonverbal language, which sometimes occur as dissonances, can open up creativity in the field of transference.