 When Costa de Beauregard in 1947 suggested this response to the EPR argument to his then supervisor de Broglie, de Broglie was “far from willing to accept” the proposal (1987b: 252) and forbade Costa de Beauregard to publish his unorthodox idea (Price &amp; Wharton 2015). However, in 1948 Feynman had developed his eponymous diagrams in which antiparticles were to be interpreted as particles moving backward-in-time along the particle trajectories, and so by 1953 de Broglie had endorsed the publication of Costa de Beauregard’s response. On the seeming craziness of the proposal, Costa de Beauregard claims, “[t]oday, as the phenomenon of the EPR correlations is very well validated experimentally, and is in itself a ‘crazy phenomenon’, any explanation of it must be ‘crazy’” (1987b: 252; see also Costa de Beauregard 1976, 1977b, 1987a).