Well, Walken's performance in Pulp Fiction was really something special. He has this very particular way of speaking and acting that just draws you in. When he was on screen as Captain Koons, he brought a sense of authenticity to the whole military - watch - heirloom story. This made the audience more invested in Butch's character arc. His performance also added a touch of the absurd, which is very much in line with the overall tone of Pulp Fiction. It was like a little piece of a different world that was inserted into the movie, but it fit so well that it became an integral part of the film's charm.