Freegans

I thought this was very interesting.
A couple relevent quotes:
"The lifestyle involves salvaging discarded, unspoiled food from supermarket dumpsters, known as 'dumpster diving'"

"At one point, it defines freeganism as "an anti-consumeristic ethic about eating" but goes on to describe practices including dumpster diving, plate scraping, wild foraging, gardening, theft, employee scams, and barter as alternatives to paying for food."

Blast, your classes cater to freegans!