In documentaries, "Bigger, Stronger, Faster" is an eye opening look into the world of steroids and body building. "When We Were Kings" is the definitive Muhammad Ali documentary, chronicling the lead up to the Rumble in the Jungle. "The Cruise" is one of the definitive documentaries about New York City, following around a fast talking, half crazy tour guide as he describes in his jangled eloquence all the things the city means to him (it sounds horrible, I know, but it's totally mesmerizing). "Exit Through the Gift Shop" is sort of a documentary version of "Total Recall" in that most of the debate seems to be about whether it's real, but the evolution of the character "Mr. Brainwash" is both horrifying and amusing, real or not (and I think it's real). "Trinity and Beyond" is, for me, the definitive look at the history of the nuclear bomb. But mostly it's an excuse to look at dozens and dozens of (admittedly beautiful) explosions as an awesome soundtrack by the Moscow Symphony Orchestra plays. "Pulling John" is an oddball look at the world of championship arm wrestling, which has been dominated by some guy from Utah for like two decades. It follows around a loudmouth, idiot hick and a soft spoken but gigantic Russian as they look to grab the title from the aging champion. "The King of Kong: A Fistful of Quarters" is the justifiably famous look at the world of elite classic gaming -- especially Donkey Kong -- where an out of work nice guy teacher looks to take the record of highest ever Donkey Kong score from the hatefully smug Billy Mitchell.
All of these received five stars from me on Netflix, in addition to the "Fog of War", which was already mentioned.