Hope this isn't a repost...

If you have an hour, check this documentary out:

http://www.nfb.ca/film/carts_of_darkness/

reallly interesting stuff, it's about homeless bottle collecters on Vancouver's North Shore, and focuses on some of their addictions as well as their very extreme make-shift sport of bombing the Shore's roads on shopping carts.
I've driven some of those roads...very steep.

it's a bit rough initially, but gets into some deeper stuff pretty quickly. Very cool...