The Chamber of Horrors match occurred once, at the 1991 Halloween Havoc. Its competitors were two teams of four wrestlers. The match takes place in a Thundercage which contains a smaller cage in the center of the ring with the "Chair of Torture" (electric chair) in it. In order to win the match, a wrestler has to pull a lever located on the cage wall (the terminator), while an opposing wrestler is in the "Chair of Torture". As a result, the match ends with the wrestler in the "Chair of Torture" being 'shocked'. From Wrestling match types on the Pro Wrestling Wiki.