Diablo Cody addresses teenage cannibalism in ‘Jennifer’s Body’

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.