Twilight will never be remembered for its special effects; it was the camp of Taylor Lautner's werewolf transformation and pseudo-illumination of the Cullens' porcelain skin that arguably kept the movie from taking itself too seriously. Thankfully, the producers saw it fit to not include this one effect: Chuckesmee. It's something so terrifying that we're convinced it would have made those beheadings at the end of the final movie seem like child's play.
“Chuckesmee was a giant misfire on all fronts,” director Bill Condon explains in the newly released box set, Twilight Forever: The Complete Saga. The crew's efforts to create something "otherworldly" for Edward and Bella's daughter Renesmee (a hyper-intelligent, rapidly growing child), transformed into an animatronic doll with a face like the demon toy, Chucky. Dubbing it as a "giant misfire" is putting it lightly. This doll is downright terrifying. Had a Gremlin mated with a human, this would be the result. Its eyes don't gaze, they pierce; its head creeks, and suddenly, repressed images of The Exorcist flood the brain. And, here we thought those tiny putti in Renaissance paintings were nightmarish. See for yourself below, but you might want to have some tabs of cats open to, you know, keep your sanity after. (Yahoo)