Conversation so far:
what is in the suitcase in pulp fiction
Quentin Tarantino has admitted that there is no official explanation behind the briefcase’s contents in Pulp Fiction
what are some theories about the content of the suitcase in pulp fiction
Some theories say that the Pulp Fiction briefcase is Marcellus Wallace's soul, or that it contains the diamonds from Reservoir Dogs, Elvis' gold suit from 'True Romance', or an Oscar.
what made people think that the briefcase contained marsellus wallace's soul
The proponents of the soul in the briefcase theory, mention the glow emanating from the briefcase, the 666 lock combination, and the band-aid on Marsellus Wallace's neck.
why is the band-aid on marsellus wallace's neck significant for the soul in the briefcase theory
Because of Marsellus Wallace's Band-Aid, some people have erroneously said that the Bible states that the devil takes your soul from the back of the neck.

Question: what was the real reason
Self-contained rewrite: what was the real reason that marsellus wallace had a band-aid in the back of his neck