Pulp Fiction sucks because of Harvey Keitel.

In order to get Keitel in the movie, Tarantino had to write the scene where Travolta shoots the black kid's face off in the car.
...So Tarantino had to write a scene where a professional killer, who we just saw holster his gun in the previous scene, needs to go against character and wave his gun around in a moving car, in public view, for anyone to see just so it can go off accidentally....

and Tarantino put himself in the movie: there ain't no way I'm gonna believe that "Jimmie" would be able to talk like that to "Jules." Jules would eat him up and crap him out all in one bite.