The theory that everything in life is interconnected. Like 6 degrees of separation (or Kevin Bacon), only on a quantum level.

In 1997, a physicist at the University of Geneva divided photons and, using fibreoptic cables, sent the pairs of light particles over six miles apart. Reaching the ends of these fibres, the two photons were forced to randomly choose between alternate pathways. Uncannily, in every case, the choice of any one proton mirrored its partner, even though there was no physical way for them to communicate with one another. The Geneva experiment suggests to many physicists that some sort of quantum physics code that interconnects everything in the universe, including life itself.

A more practical example would be thinking about an old girlfriend moments before she calls you on the telephone and wants to talk about the past.