Luke Evans and Josh Lake, students of BA Graphic Design and Photography at Kingston University had the idea of converting their own body into a camera to see how it would all work out. So the two ate 35 mm photographic film slides and let their body do the rest.
Too bad they forgot to eat up a flashlight as well, because films tend to get images on exposure to light. Nevertheless, they “expelled” the film in the dark and then developed the images to show some really interesting patterns. Weird things the body does to film slides.