'You' Commit Suicide in the Haunted Mansion
The Haunted Mansion, an attraction in Disneyworld, is a pretty dark ride, already. To make it even creepier, this theory states that "you" commit suicide at the end of the ride and become a ghost.
At the beginning of the ride the ghost host (the narrator) says the only way to escape the mansion is to die, and he shows that he hanged himself. Near the end of the ride there's a moment where the ride vehicle turns around backwards and you go off a balcony, which according to this theory represents you jumping to your death.
Before this part of the ride the ghosts are all trying to scare you, but afterwards they sing excitedly and invite you to party with them. (The Grim Grinnin' Ghosts song.) The only human character in the ride, a groundskeeper, appears after the balcony drop. He faces toward the riders and seems terrified of you.