It's her post-Oscar comic-teen fright flick

VANCOUVER, CANADA — The VOMIT shot out of Megan Fox like water from a geyser. A ghastly movie concoction that looked like a mix of used motor oil, lawn clippings and the slag at the bottom of a Souplantation trash bin, the black puke sprayed actors Amanda Seyfried and Johnny Simmons, whose characters were doing their best to fight off a cannibalistic fiend, an otherwise popular cheerleader named Jennifer Check.

It was among the more gothic scenes in "Jennifer's Body," a closing battle with fewer rules than Ultimate Fighting, pitting Jennifer ("Transformer's" Fox) against her longtime friend Needy Lesnicky (Seyfried, of "Mamma Mia!") and her relatively wimpy boyfriend Chip Dove ("Evan Almighty's" Simmons). The movie's swimming pool location, inside a derelict juvenile hall slated to become a hospital for British Columbia's criminally insane, was forbidding in its own right. The flotsam in the pool's filthy water -- leaves, a wheelchair, beer cans -- made the entire setting for the film stomach-turning, especially since the young actors had to swim in it.

Somehow, though, it wasn't quite disturbing enough.

"The vomit has too much hang time," said Karyn Kusama ("Girlfight"), the film's director. "It's arcing too much." Screenwriter Diablo Cody wondered aloud, "Can't we adjust it, like a shower head?"

So the "Jennifer's Body" special-effects team reset the compressed-air-powered rig, which discharged the artificial throw up from a tube hidden near Fox's mouth. Carrying a lot more momentum, the barf in the subsequent take screamed out with the trajectory of a Manny Ramirez line drive. "That's our money shot," Cody said as the actors toweled themselves off.

Classing it down?

Oscar-WINNING screenwriter Steven Zaillian followed his "Schindler's List" win with "A Civil Action" and "Gangs of New York." After winning his "Forrest Gump" screenwriting Academy Award, Eric Roth scripted "The Insider" and "Ali." Ronald Harwood went from the Oscar-winning "The Pianist" to "The Diving Bell and the Butterfly." Cody's post-Oscar path follows a much different direction.

Fresh from her "Juno" triumph, a debut script that not only brought her the 2007 original screenplay trophy but also made her one of the town's most in-demand storytellers, the 30-year-old Cody decided to make a horror film.