LOS ANGELES (Variety.com) - The magic word at the box office this weekend was ?Shazam!? Warner Bros.? latest superhero adventure easily topped charts in North America, pocketing $53 million when it debuted in 4,217 venues. Buoyed by positive reviews, ?Shazam!? arrived ahead of expectations, which anticipated a start around $40 million to $45 million. The film also earned $3 million in advanced screenings for a domestic haul of $56 million. While ?Shazam!?