"Heidi Is a Headcase" was written by Joey Ramone and Daniel Rey. Halliday also collaborated with Headcase, Bias, Acid Android and DJ? Acucrack, Headcase, The Killers, Acid Android, and Orbital. After graduating in 2006, Hische worked for Headcase Design in Philadelphia, PA. Then she reveals her soul-self to Headcase, terrifying and defeating him. Then she reveals her soul-self to Headcase, terrifying and in so defeating him.