A California man was arrested on Thursday for threatening to kill Moon Unit Zappa
because he believed that she and her late father, hippie rocker Frank
, stole the lyrics to their 1982 hit song "Valley Girl" from him. Timothy Mark Brownfield
, 40, tipped himself off to the FBI by allegedly sending them creepy letters outlining his diabolical plan, according to Reuters. If convicted, he faces five years in federal prison.