However, there is just way too much of the above mentioned "effects," and they detract from what could be an incredible movie. I don't know what purpose they served, other than making the film have a "unique" (and headache-inducing) style. The film's style isn't the only thing that'll make your head hurt. Natural Born Killers was made to criticize and satire America's obsession for violence, and while at first a fascinating concept, its constantly shoved down your throat nearly every five minutes, so much so you'll get a headache from that too after about an hour.
And I hate to sound like an old fart, but the film did go overboard with the violence. It's not so much what is shown but rather the nature of it; I don't want to give anything away, but some of the things shown sickened me (most of all some subliminal flashes of what looked like graphic images from The Holocaust; completely unnecessary and offensive in a film like this).
The violence is gratuitous and forced, and while that is probably the point, that didn't stop it from making me feel nauseous and even a little angry. Still, check it out if you have a strong stomach and are willing to see something unique. It's not a bad film, but my God is it brutal and inhumane.