On a Sunday morning in May, a paranoid man walked up to the Glendale police headquarters and began asking a slew of questions. "I know this is gonna sound crazy, but I feel like there are people following me. I feel like there was a chopper -- do you hear a chopper?" the man asked, suspicion seeping through his voice. Informed by an officer that police in the L.A. suburb were not flying any helicopters, he began to waver. "So it's not yours. Do you hear one? I could be nuts."