Already for decades, a classic joke is circulating among Lacanians to exemplify the key role of the Others knowledge: a man who believes himself to be a grain of seed is taken to the mental institution where the doctors do their best to finally convince him that he is not a grain but a man; however, when he is cured (convinced that he is not a grain of seed but a man) and allowed to leave the hospital, he immediately comes back very trembling of scare - there is a chicken outside the door and that he is afraid that it would eat him. Dear fellow, says his doctor, you know very well that you are not a grain of seed but a man. Of course I know that, replies the patient, but does the chicken know it? Therein resides the true stake of psychoanalytic treatment: it is not enough to convince the patient about the unconscious truth of his symptoms, the Unconscious itself must be brought to assume this truth.