most harrowing scene in film

without a doubt in my mind, seeing JKF cop the head shot, it was ****ing harsh, his whole ****ing head comes apart, made me feel so sad

Yeah.
I think Sin City had a few scenes that are harrowing. First, the scene where Murv cuts off Kevin's legs and then feeds him to the dog and then cuts off his head, it wasnt graphic because it wasnt in true colour, but the idea behind it is still kinda of gruesome.
Also, the scene where Willis rips off The Yellow Bastard's lower unit and then beats him to a bloody pulp was pretty gruesome also.

i thought of a new one, when Raphael gets the sh%t kicked out of him by the foot clan. i cryed for like never.

I didn't like in Universal Soldier where Lundgren impales that needle through the black guys cheek. It gives me the shudders...

I wouldn't consider anything from Sin City to be graphic. It was comical violence. Very cool but not at all shocking.

Its still graphic.
I do admit its not real like The Passion Of the Christ. But some scenes in Sin City are still pretty graphic. Its not a bad thing though.

harrowing, i think i can add the scene in the BRILLIANT Ravenous when Colhqoun tells the story of how the travelers started to eat eachother. Real good chills there. Good story too.

Probably some of the scenes from schindlers list.