Psychologist Carl Jung believed that there are times
when seemingly unrelated, coincidental events are
indeed related; and further, they are organized by
an unseen, underlying dynamic.

Jung coined the term Synchronicity to refer to
this meaningful co-occurrence of events.

Psychologist Charles Tart (1981) writes,

. . . synchronistic causality represents genuinely
causal relationships that we are forever unable to
satisfactorily grasp because of the inherent limits
of human nature.

Those who write about synchronicity rely on
examples of synchronistic events to convey the
concept. Here's an example given in Harry A.
Wilmer's Practical Jung (1987).

When English actor, Anthony Hopkins landed the
leading role in the screen adaptation of the novel
The Girl from Petrovka, he tried to buy a copy of
the novel to prepare for the film.

In those pre-eBay days, Hopkins couldn't locate a
copy, so he resigned himself to do without.

One day, shortly thereafter, while walking through
Leicester Square, he noticed a book on a bench -
it was The Girl from Petrovka.

Later, during the shooting of the film, Hopkins met
the book's author, George Feifer

Feifer told Hopkins that he no longer had a copy of
his own novel - he had loaned it to a friend, who
subsequently lost it.

Hopkins showed Feifer the copy he had found on
the bench

Feifer recognized notes within the book as his own;
and he knew he had recovered his lost book.