White background with a red banner with a white star on top and a blue banner with a white star on the bottom. The texy lays between the banners and is blue
The phrase "Hey Rube" is an old carnival term meaning there was a physical confrontation between locals and the carnival folk. If "Hey Rube!" was called out it meant there was trouble and assistance was needed right away.
A great source for Carnival terminology is Sideshow World.