Anyone who was in the massive convention hall during the 2017 D23 Expo still remembers it clear as day: back then Pixar was introducing a new project as Untitled Pixar Film That Takes You to a Suburban Fantasy World and its director, Monsters University’s Dan Scanlon, told an emotional story about his father’s death, and being too young to remember him. And then he played a snippet of audio he had uncovered; it was the only time he’d heard his father’s voice. You could hear the sniffles in the cavernous auditorium. And it was a few …