The image of Anna, the family servant, taking against her naked breast the body of Agnes, either suffering or dead, serves as a point of support to approach the limit of representations when it comes to thinking about an origin in which Eros seems to have made an alliance with Thanatos. Three clinical situations allow to explore the ways in which a lived experience taking place at the limit of the thinkable seeks to make its way in the psyche: special adoption circumstances where the path to give a shape to anxiety takes the form of pictograms and thing presentations ; a case in which Thanatos seems involved in conception and childhood and where it is through staging that representations emerge to think about the origin ; and a violent attack involving an idealized figure which weakens the legitimacy of existing and becoming, and which brings out the weight of a melancholy core where masochism seeks used to bind the violence.