The Avon Theater in Decatur, Illinois is described as a haunted building where staff and visitors have experienced inexplicable events like doors opening and closing, lights flickering on and off, and the sighting of ghostly figures. The primary ghost is believed to be Gus Constant, the theater's former owner and manager, who is thought to linger because he was unhappy with renovations after his retirement. His apparition has reportedly been seen in the doorway of his old office, and the theater is considered actively haunted by its staff. Staff members have reported experiencing doors opening and closing on their own and lights turning on and off unexpectedly. A ghostly figure, often identified as Gus Constant, has been seen in the auditorium and standing in the doorway of his former office. Other unexplainable occurrences have led staff members to believe in the theater's haunting. The ghost is said to be Gus Constant, who was unhappy with renovations done to the theater after he retired. He is said to manifest his displeasure by knocking things over and damaging equipment. His spirit is frequently associated with his former office at the theater.