The gift is an effraction in the circle. If it is the impossible, this is not to say that it never happens. The impossible is what is unearned, what comes in response to no request or demand, or as a consequence of anything at all, but presents itself as miraculous.

An impossible moments: two lovers, simultaneously, say "I love you":

the single flash achieves this unheard-of thing: the abolition of all responsibility. Exchange, gift, and theft (the only known forms of economy) each in its way implies heterogeneous objects and a dislocated time: my desire against something else--and this always requires the time for drawing up the agreement. Simultaneous proffering establishes a movement whose model is socially unknown, unthinkable: neither exchange, nor gift, nor theft, our proferring, welling up in crossed fires, designates an expenditure which relapses nowhere and whose very community abolishes any thought of reservation: we enter each by means of the other into absolute materialism. (Barthes, A Lover's Discourse 150-1)