Walter Salles, the Brazilian director who earned raves last year for "The Motorcycle Diaries," adds credibility to the project. Connelly says she wouldn't have gotten involved if it was just blood and guts.
"I think it's a sophisticated scary film because, on one hand, it's literally a supernatural ghost story," Connelly says. "On the other hand, it's a story about a woman confronting her own ghosts, her demons from the past."
As the title suggests, Connelly's character gets soaked in the sludge and it's not simply the metaphoric bilge of a failed marriage. The 34-year-old actress, who married her "Beautiful Mind" co-star Paul Bettany two years ago, says she had to descend into a makeshift pool where 70-to-80 pounds of muddy water was blasted at her by Jacuzzi-like jets.
"My arms were just covered with bruises," she says. "But as a bit of a tomboy, I was quite proud. I'd come home and say, "Honey, look what I got today,' to show off my war wounds."
Similarly, the faucet has been turned full force for Asian horror. But who will be bruised? Filmmakers or filmgoers? Like with any good thriller, we'll just have to wait to see who gets hacked to bits -- and who gets to do the hacking.