'New Year's Eve' Movie -- Crew Guy Sues -- My Head Got Forked Up On Set

"New Year's Eve" sucked for anyone who had to sit through the movie (7% on Rotten Tomatoes) -- but it REALLY sucked for a set builder who was "gravely injured" in a forklift accident during filming, according to a new lawsuit.

Scott Canfield says he was working on the set in Feb. 2011, and while standing on a pallet that was hoisted into the air by a forklift, he took a huge fall. In the suit, he doesn't detail how he fell or from what height.

But according to the docs, it was high enough that he cracked his head ... and suffered a traumatic brain injury and other physical and psychological damage.

He's now suing Warner Bros. and New Line Productions for medical expenses and unspecified damages. The studio had no comment on the lawsuit.

Ditto for why the movie was so awful ... we're guessing.