“I don’t want to end up being a nothin’.” American Movie premiered 25 years ago. I saw it for the first time when it played my college campus. Back then it almost felt a mockumentary, except its subjects were real people. I still remember the sound of the laughter erupting in the theater when American Movie’s subject, independent filmmaker Mark Borchardt, tried and failed to shove one of his actors’ heads through a cabinet door during the shooting of an ill-advised stunt for his horror movie, Coven. Mark calls action and then Bang! throws his poor star into the cabinet door. The door doesn’t b…