I have a graduate student who asked me if I had seen, Cannibal Holocaust. Films rarely get bleaker than that.
I just saw Rambo this evening, while getting a new tattoo. Holy shit, it's the Rambo film. Hundreds die, bodies fly and body parts are everywhere. I've seen far harder stuff, but for a mainstream, "R" rated film, it definitely lives up to the kill-crazy Rambo mythos far greater than all previous entries, and it was actually pretty damn good. Far more grindhouse than that Tarantino film of the same name.