Movie fans are hoping that clues about a magic show in a New York City park are breadcrumbs leading to a Now You See Me spectacular—and they have a theory for who is behind the Louvre museum heist.

Pulling a rabbit from a top hat. Teleporting from one cage to another. Finding a coin behind a five-year-old’s ear. Magic has long inspired a sense of awe and wonder, but one portion of the population ...