The park's annual "Knott's Scary Farm" has drawn crowds since 1973. The idea for this event was presented at one of the regularly scheduled round table meetings for managers by Patricia Pawson. The actual event was created by Bill Hollingshead, Gary Salisbury, Martha Boyd and Gene Witham, along with other members of the Knott's Berry Farm Entertainment Department as documented in the DVD "Season of Screams." Initially fake corpses and other static figures were rented from a Hollywood prop house, but Bud Hurlbut, the creator/concessionaire of the Mine Ride, Log Ride and other rides at Knott's, decided that this wasn't enough. He dressed up in a gorilla suit and started scaring guests on the Mine Ride. Halloween Haunt was an instant hit, and by the next year, the event sold out nightly. During this special ticketed event, the entire park (or major portions of it) re-themes itself into a "haunted house" style attraction in the form of mazes and "scare zones" in the evening. Over a thousand specially employed monsters are also scattered—often hidden out of view—throughout the park at this time. Some of the characters have become well-known, such as the green witch, which has been portrayed by Charlene Parker since 1983, the longest of any performer. Several attractions are decorated for the event including the Timber Mountain Log Ride and Calico Mine Train and there are 13 mazes of various themes. Elvira (actress Cassandra Peterson) was introduced into the Halloween Event in 1982 and was prominently featured in many Halloween Haunt events until 2001. According to postings on her My Space page, Cassandra was released from her contract by the park's new owners due to their wanting a more family friendly appeal, although she returned for one night in 2012 for the 40th anniversary of the event and has returned as a regular performer throughout the run of the event for the last several years. During the month of October, Knott's Scary Farm generates half the revenue for Knott's Berry Farm's fiscal year.