There have been plenty of rumours as to what was in the case. The original inspiration for the glowing case was the 1955 film noir Kiss Me Deadly.

As for the contents, some claim it was Elvis’ gold suit from True Romance, to a copy of Spider-Man No. 1 to Marcellus Wallace’s soul. There was even a plan for the case to contain the diamonds from Reservoir Dogs. Instead, Tarantino just wanted the case to be filled with whatever the viewer wanted it to be.