Some say that everyone in the world has an identical twin somewhere out there and, while most people never meet their doppelgnger, one often catches a glimpse of someone that closely resembles a familiar person.
But, to have two reasonably famous people resemble one another is very rare. In situations like this, the two are bound to know about each other and great mischief can result, especially if one of the two is Mark Twain.
Twain, born in 1835, was almost a dead ringer for Supreme Court Justice Melville Weston Fuller, born in 1833. While the two men differed during their early years, their penchant for large unruly moustaches and long wavy white hair in their later years made them look almost identical.
They were so identical sothat Twain was once stopped in the street by a passerby who mistook him for Fuller. The passerby reportedly requested an autograph to which Twain famously wrote:
"It is delicious to be full, but it is heavenly to be Fuller. I am cordially yours, Melville W. Fuller."

