Remember The Mask? Of course you remember The Mask! That was the film that really solidified Jim Carrey as the funniest guy to talk out of his butt in the minds of movie-goers, and also introduced the world to Cameron Diaz, back before we were all sick of her. It's got a wonderfully cartoony sensibility, largely inspired by the cartoons of Chuck Jones and some goofy-yet-endearing CGI wackiness.
But in the early concept art that was distributed in press kits a year before the film's release, it looked more like a nightmarish horror film. Seriously. Check out these insane images found by redditor Join_You_In_The_Sun: