There is only "One" person in the entire universe for you
Worst example: "Serendipity," "You've Got Mail"
Goddamit, I'm sorry, but this movie. A huge number of rom-coms have trafficked in the ridiculous, damaging myth that only one person on the entire planet -- conveniently located in our own backyard! -- is our soulmate, but "Serendipity" takes it one step further by suggesting there's a mysterious force that manifests in signed five-dollar bills and fortuitously-glimpsed constellations is conspiring to bring you together. I can't stress this enough: John Cusack leaves his beautiful, thoughtful fiancee at the altar because he's convinced the universe wants him to be with Kate Beckinsale. I hope these two are miserable together, I really do.