The so-bad-it's-scary prequel Exorcist: The Beginning overcame horrifying reviews to place first at the box office with $18.2 million. That left Seth Green's new comedy Without a Paddle up a creek with $12.5 million, followed by Princess Diaries 2 (No. 3 with $13.2 million) and last week's top flick, Alien vs. Predator (No. 4 with $12.5 million), which tumbled 67 percent from its debut. The shark-infested thriller Open Water, meanwhile, expanded to more theaters and grabbed the No. 5 spot with nearly $12 million.