At some point the grossness level of these trailers for Saw IV started, like the US space program, competing against themselves in a game no one is watching anymore. This one features ol' Jigsaw getting all sorts of organs and things yanked out of him in a graphic autopsy. I can't wait for the next ad, where I hear someone fills Jigsaw's now-empty body cavities with vomit, blends the whole thing, feeds it to a midget, cuts open a giant, stuffs the midget inside the giant, then walks the giant/midget cocktail into a bear trap, all while a man with his eyes gouged out eats a bowl of human feces and baby heads. It's totally awesome.
I think you have to do YouTube's age-proving thing before watching this, to prove you're of age to throw up.