Time travel is very real, as is the parrellel universe theory. Just look back at the Philadelphia experiment or Montauk.
Back to disturbing movies for a moment-i'd recommend the entire David Lynch catalogue. The Elephant man, Eraserhead, Blue Velvet, Wild at heart, The lost Highway and Mulholland drive.(Dune, but Lynch admits its his worst as the budget wasnt up to snuff)) I love Mulholland drive, but as with the rest of my suggestions, its either love it or hate it. He makes by far the most disturbing movies out there, especially Mulholland, Bllue velvet and The lost highway. Go rent them now!!!!!!!!!