"Fantastic Beasts: The Crimes of Grindelwald," won the weekend box office with $62.2 million, but that's lower than the opening for 2016's "Fantastic Beasts and Where to Find Them." It's also the lowest opening weekend ever for a "Harry Potter" film. Meanwhile, other new releases "Instant Family" and "Widows" fell flat. With the incredible success of the "Harry Potter" movie franchise in the early 2000s, Warner Bros.