Greatest Guerrilla Film. what's your favorite low budget movie?

I'm grateful for the honor our film Sister Aimee has received, and I must take a moment at the computer to share how other guerrilla filmmakers have inspired me. Even filmmakers like Edward D. Wood Jr, who is often mocked by many as the worst director of all time, inspired me by his making seven films on a shoestring, despite derision, evictions, alcoholism and other battles. His films are interesting, and I don't think they are the worst of all time. He accomplished something his critics never did, 7 movies he made as an auteur that say "Made in Hollywood, U.S.A." at the end.
Kevin Smith inspired me by the way he dropped out of film school and made "Clerks" for $28,000 (some say $15,000, but Kevin himself said 28k) His shot composition is very conventional and tripod-bound but his ear for dialect is quite a talent.
George Romero is also a hero to me, because he shot "Night of the Living Dead " in my hometown of Pittsburgh (actually north of the burg in Evans City) on a small budget and it is such a groundbreaking horror film.
David Lynch is another great director and "Eraserhead" is one my cult film classics. He squatted in a building at the American Film Institute and made this when he was near destitute, his only income came from selling the Wall Street Journal.
Robert Rodriguez and the making of "El Mariachi" is quite a story and captured quite well in his book "Rebel Without A Crew." In my opinion both Rodriquez and Kevin Smith's best films were their initial guerrilla films.
I love what Ingmar Bergman did in his films "Persona" and "Seventh Seal." He inspired me in making "Sister Aimee" in his focus on close-ups and psychological character study and interior shooting on a small budget.