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.
Disneyland Secrets. I doubt this one, but it would hurt to try next time.