Blood Diamond easily. One of the best movies I've seen and the subject is all too true (though the diamond company's name in real life is De Beers). A bit of information for those that have or have not seen the movie: If you think diamonds are rare, think again. Sure, their might be some that are considered rarer that have the perfect clarity, color, and size (carat), "the three C's when buying diamonds", but watching this movie will give you a short glimpse into what the diamond market is truly like. The De Beer's company has, and more than likely, always will have a virtual monopoly on the global diamond market as they buy every stone worth buying and simply stash them away in vaults to keep the supply low and the price high. It's also not unusual to have Jewish (for some reason) people walk into a shanty of a house with multiple armed guards all over crap towns in 3rd world African countries with thousands of dollars to purchase diamonds that will retail for more than most people can fathom...but that's the way it is...for those who've seen the movie: TIA.
I like several more, but that would be my favorite.
Cheers to all,
Mike