I remember partially watching a movie on an airplane. It was about a woman who is able to see the ghost of a Samurai or some other warrior who was beheaded, I think falsely for being a traitor. Anyways, I think the woman and the ghost set out to do...something. I don't remember, but I think it was to clear his name?
Anyways, along the way, the woman meets another man who is outwardly extremely skeptical about the supernatural and says that there must always be a trick involved somewhere where the supernatural is apparently at play. The woman figures out that the man is actually capable of seeing the ghost, and theorizes that it is because the man's favorite Indian dish contains cinnamon, which is connected to the spirit world.
Anyways, eventually the woman and the ghost figure out that the ghost would be able to send messages to the material world by interacting with a small object that the woman holds between her fingers. If I recall correctly, it was shaped like or is a Lifesaver candy. Eventually, there is a scene in a courtroom where the woman and the ghost use the communication trick to enable the ghost to respond to yes/no questions.
Then, the man starts going on a monologue towards the other people present, while the ghost talks over him. Eventually, the man yells at the ghost to shut up, revealing to everyone that he can see and hear the ghost. I don't remember anything else from the movie.