My very favorite "red stain" film is Support Your Local Sheriff!, where James Garner bluffs a young Bruce Dern by dribbling red paint on the floor in his jail, as the cell bars had not arrived to be installed. Dern sees the lack of a cell perimeter and asks why he can't just walk away? Garner replies by showing him the white chalk line where the bars should be and the red stains just outside of the line. Walter Brennan is Dern's father, who when visiting his "son", is rather ashamed to have a criminal son such as Dern. It's a real classic :lol:.