Lacan’s notion of “objet a” designates the paradox of an object which gives body to a surplus over all determinate objects, an object which gives body to a lack constitutive of desire. What happens with this object at the end of the psychoanalytic treatment? The text proposes a parallel between the final moment of the treatment and the final reversal in telling a joke: in both cases, the sudden shift of perspective enacts what Lacan called the fall of the object, its change from a fascinating mystery to an excremental remainder.