Today I rang the gong and was granted "vision." Immediately afterward I noticed over by the graveyard what looked like a ghost, just standing there. I clicked on her, and nothing happened. I was just about to take a screenshot when she disappeared. Is this what happens when the gong grants vision? I've only had it grant vision one time before, and didn't think to check if it meant my villagers had visions of ghosts!

If that wasn't it, it was a very odd glitch indeed.