An enterprising horror film producer would likely reject my suggestion to cast Tuscon’s Bob Log III as a slasher villain as too outlandish or implausible, someone audiences wouldn’t believe actually existed. They’d be wrong, of course. Here is a man who has spent a decade-plus playing around the country in jumpsuits of dubious cleanliness and always wearing a motorcycle helmet rigged to a telephone receiver that doubles as a microphone. His shows have a reputation for chaos, while the music is a rollicking one-man band driven by slide guitar and a veneer of sleaze.