Episode #3 of Flirting with Film: "Underexposed Film Grain for Effect." I shoot a roll of Kodak Portra 800 in low-light conditions in order to maximize on grain. Make sure to subscribe to my channel so you can be updated when new videos come out.
Above: Notice the thin area of this negative (shadow). Although there is still usable information in this area, as you lighten it up, either in the darkroom or digitally, you'll see an increase in film grain.
This negative features more density on the camera-side of the subject and will result in less grain.
See the video for more BTS and images.