As per a recommendation on a thread on this site, I just bought and watched OVERNIGHT, a 2003 documentary on Troy Duffy, the director/writer of BOONDOCK SAINTS.
WOW. This will haunt me for a little while. The footage was shot using VHS/SVHS cameras, but it still had a gritty, down to earth look that supported the story of ego and hubris destroying someone's career. Troy Duffy comes across like an ego-maniacal bastard. Immediately after speaking to a University of Boston film class, he tears on them at the bar afterwards for questioning him.
Amazing and highly recommended to anyone who suffers from delusions of grandeur when it comes to their film work. This along with AMERICAN MOVIE, a 1999 documentary on a horror filmmaker, should be required viewing to anyone hoping to make a career in filmmaking.