What was in the briefcase at the end of Pulp Fiction?

Apparently Quentin Tarantino himself doesn't know; originally it was supposed to be diamonds, but he soon realized that was too mundane. Eventually he just decided to leave it unknown, so each viewer could imagine it for themselves.

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Some fans have speculated that it is Marcellus Wallace's soul, which he had sold to the devil, and which Sam Jackson and John Travolta had managed to buy back from Lucifer for him. This is just a theory, but it is a pretty cool one. I have included a link to the snopes.com page that has all the details. ybarra-cgm.com

It seems that the briefcase might be a reference to a 1955 noir movie called Kiss Me Deadly, which featured a trunk filled with radioactive material. Just like in Pulp Fiction, the contents of the trunk glowed mysteriously. However, Quentin Tarantino claims that the correlation is just a coincidence. copyright ybarra-cgm

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