Harry Potter has cast his biggest spell yet with a record-breaking first day at the box office for his final film. Distributor Warner Bros. reports that "Harry Potter and the Deathly Hallows: Part 2" summoned up $92.1 million domestically on opening day Friday. That's nearly $20 million more than the previous record-holder, "The Twilight Saga: New Moon," which took in $72.7 million in its first day two years ago.