Two friends meet in a bar, drink a beer, smoke a cigarette, and remake the universe.
 They talk about... twins, Fermi, grandfather, friendship, Olbers, temporality, Erwin's cat, Louis de Broglie, tea leaves, arrows, entanglement, trains, Werner's uncertainty...
 This uncertainty which also reminds one of the two of this famous joke:
 Heisenberg, driving at high speed on the highway, is stopped by a policeman for speeding. The latter asks him:
 "Do you know how fast you are going, sir?"
 "No, but I know exactly where I am!"