I just learned about Roky Erickson recently. In the 1960s, he led a band called the 13th Floor Elevators. They basically did all manner of psychedelic drugs and wrote songs about horror films and science fiction. (Awesome). Roky wound up being diagnosed as a paranoid schizophrenic after devolving into gibberish on stage in the late sixties. He spent time at the Rusk State Hospital for the Criminally Insane where he received electroshock treatments and Thorazine. In the ’80s, he claimed that a Martian inhabited his body, but after making a legal statement about the indwelling to a notary public, the attacks stopped. He is still touring and recording.
So, all that to say that I bet ol’ Roky Erickson wrote this song after sincerely really believing that he walked with a zombie last night. I see no reason to be skeptical. Happy Halloween.