South Park animators have "hidden" visitors in many episodes, especially early in the series. They poke a little fun at this practice in "Canceled" when the receptionist at the proctologist's office is a Visitor disguised only in a wig. Then, to the sound of percussive music, this Visitor dramatically removes his/her wig. In the latest season it was a contest for viewers to find where they were hidden. They can predominantly be spotted in different places in certain episodes. Some of these visitors could be in fact citizens of South Park.