Dobrev reveals members of the crew were left terrified when a piano started playing of its own accord, presenting problems for the shoot.
She tells the Associated Press, "The ADs (assistant directors) started screaming, 'Stop! Whoever that is stop the music. We're rolling. Cameras are on.'"
She also claims to have undergone a ghostly experience herself when the lights in one room began "spontaneously coming on and off".
Dobrev insists she didn't believe in the supernatural before the shoot, but "all of a sudden it was kind of happening and it was kind of weird".