Agnes Varda's
The Gleaners and I is one of my favorite movies - so thanks to Christopher Gordon for reminding me of it! Varda speaks with a variety of people who "glean", that is, people who pick up leftover, discarded, excess, or otherwise unwanted but still potentially edible food.
Varda has a deep sympathy with gleaners of all kinds, because they find value in things that most other people around them ignore or disdain, and she sees herself as doing something similar in her films. And Varda also gives the viewer a thorough history of gleaning, which derives from a tradition of allowing the poorest members of society come in after the harvest and take whatever remained -- Varda is particularly fond of the French painter Millet's image of "The Gleaners," which shows one such group. Permission to glean apples (or grapes or potatoes, etc.) after the harvest has officially ended, for example, is still validated by the French legal code.
Scouring a city's alleys and sidewalks for abandoned furniture and appliances is one sort of gleaning that we know here in Chicago. I'll note, too, that taking canned goods out of the dumpster (a practice of some young punks she meets) allows one to eat food that hasn't actually gone bad, and avoids exposing the grocer to any legal liability (surely an issue in the U.S. if the grocer were handing out expired food).
I'll never try to feed myself by dumpster diving, I know -- I'm too squeamish and lazy. But the idea has historical roots and remains interesting as an example of the many lives that ordinary objects may have, the many ways that people choose to make their peace with modern life, and the variety of ways of thinking about how we get our daily bread.