Most mustaches lie waiting for some Clark Gable or Tom Selleck to fix them in the mind. The greatest are identified with a single man, a bad man, usually, who so wrapped his identity with a particular configuration of facial hair that the two became inseparable.
The Toothbrush mustache was first introduced in Germany by Americans, who turned up with it at the end of the 19th century the way Americans would turn up with ducktails in the 1950s. It was a bit of modern efficiency, an answer to the ornate mustaches of Europe - pop effluvia that fell into the grip of a bad, bad man.
The person who should really write an appreciation of the late great Dom DeLuise is Burt Reynolds, who, even more than Mel Brooks, made of the jolly, beanie wearing fat man a side-kick and a legend.
The Toothbrush mustache is the most powerful configuration of facial hair the world has ever known. It overpowers whoever touches it. By merely doodling a Toothbrush mustache on a poster, you make a political statement.