Haunted in Adventureland
During Mickey's Halloween Party, Adventureland takes on a spookier light. Even though it doesn't feature any specific Halloween-related attraction, the area around Tarzan's Treehouse has an eerie glow to it, as a cascading spectrum of color rotate around the foliage. These visuals are accompanied by a sinister ambient soundtrack, making for a dark jungle feel. It's completely without any purpose, other than to enhance the ambiance. But I like it!