Batman Arkham Asylum Episode 12: The Spirit of Arkham

"Warden Sharp harbored a dark secret, however; an alternate personality that referred to itself as "The Spirit of Amadeus Arkham". He believed that the only cure for insanity was death, and held a deep-seated hatred for every single inmate at the asylum, especially the Joker, whom that dark side of Sharp longed to murder, and also held the deep desire to burn Poison Ivy alive and lobotomize Harley Quinn."