In Pulp Fiction, Butch has a scene where he takes the cab. In this scene, the background is black and white, and is quite surreal.
I am guessing there is a reason for this, most likely a reference (I'm a teenager, so I'm guessing this is a reference to an old movie that I most likely haven't watched)
I managed to find this snippet from IMDB, but it does not mention why the background was black and white.
(at around 1h 12 mins) In the taxi, Butch throws his boxing clothes out a fully-open window, and Esmarelda tosses a butt out her open window. The squealing tires, near-miss as she leaves the alley, and background indicate she's driving fast. But as Butch smokes the cigarette, its smoke drifts slowly through the car, indicating it isn't moving because no wind is coming through the open windows. However, the back projection is heavily stylized in black & white, so the director clearly did not intend this to be a realistic shot. Although the shot may have been intentionally unrealistic, when Butch throws his gloves out the window a "plop" can be clearly heard, indicating no vehicle movement.