Carl Jung, who invented the concept of Synchronicity, broke away from Freud on this and other points. The whole of Western Civilization rests on this single premise of science. Sir James Frazier put it more succinctly, saying one pulls a string and something happens. In his view, magic and religion pulled strings attached to nothing. The itchy rash associated with poison ivy is caused by a resin that attached itself to clothing or skin when walking through the woods.
Science says two people coming up with the rash means both touched the resin.
For a long time, people believed one person gave it to another. Science would look for a cause such as the resin lingering on both people's clothing from a walk in the woods the previous summer. Synchronicity says that events such as these are connected outside the traditional structure of cause and effect. Are they connected by a system of reality we do not recognize. If so, then science poorly describes what goes on in the world, since its rules are violated more than it will admit.