History's Greatest Moustaches, Vol. IV

Groucho Marx, comedian/entertainer, maintained a matching set of moustache and eyebrows with such an odd combination of thickness and good grooming that they look fake. Incredibly fake. I think they just might have been fake.

In fact, his distinctive look inspired the most popular disguise of all time (see illustration borrowed from Grant Miller Media).

See the disguise? What a classic!