Back to the spooky past

Macy and Harli Queen - non-identical twins - visit their dad in hospital, as he is in a coma after a heart attack. but when they open the hospital doors after they had seen him, they realise something is not quite right.
How long will it take them to realise that they are back in the past?
The day of their dad's heart attack.
Back to the SPOOKY past . . .
  1. This is the way to the hospital . . .
  2. "Dad, . . . . . . what are you talking about?"
    dad tells them something that they will never forget. But they don't understand what he means.
  3. 1...2...3...4...who's that knocking on your door?