Ok, I'll play. How about a .380 Auto revolver with a short 5 or 6-shot cylinder (less than 1" long) and with the entire frame shortened to fit the cylinder. It would use moon clips (or .380 Auto Rim), have a 2 or 3 inch barrel, and a round butt grip. Make it out of stainless, and it still wouldn't weigh that much. Made from scandium alloy, it may not weigh 10 oz. I know it's just a dream (or a guacamole nightmare)...
Heck, if S&W made one I might even buy it with the IL...