I've always found Hitler's choice of lip-hair intriguing. Not the type of intrigue that includes international man of mystery; rather, what the fuck was he thinking. I'm not a fan.

Wikipedia has an interesting page on the Toothbrush Mustache, or the Hitler Mustache as it has come to be known.

The toothbrush moustache (also called Hitler moustache, Charlie Chaplin moustache, 1/3 moustache, philtrum moustache, the postage stamp, or soul (mou)stache) is a moustache, shaved at the edges, except for three to five centimeters above the centre of the lip. The sides of the moustache are vertical rather than tapered.

The style originally became popular in America in the late 19th century. It was a neat, uniform, low-maintenance style that echoed the standardization and uniformity brought on by industrialization, in contrast to the more flamboyant moustaches typical of the 19th century such as the Imperial, Walrus, Handlebar, Horseshoe, Pencil and Fantastico moustaches.

Hitler originally wore the Kaiser moustache, as evidenced by photographs of him as a soldier during World War I. There is no agreement what year Hitler first adopted the toothbrush. Alexander Moritz Frey, who served with Hitler during WWI, said Hitler wore the toothbrush in the trenches after he was ordered to trim his moustache to facilitate the wearing of a gas mask.