Black Bart, a taciturn road agent, achieved legendary renown because of his many successful stagecoach robberies and the bad poetry he left behind. When he stopped a stage, Bart invariably used just four words to tell the driver what he wanted: "Throw down the box!"

In the years between 1875 and 1883, twenty-eight drivers ultimately did throw down their express boxes for Black Bart, and after nearly every robbery he left behind a taunting verse signed "Black Bart, the PO-8"…

"So here I've stood while wind and rain
Have set the trees a sobbin,
And risked my life for the damned stage
That wasn't worth the robbin!"

Bart never wounded nor killed anyone, never took a lady's purse, and always used an unloaded shotgun for the holdup. He was eventually apprehended and sent to San Quentin.  He served a five year sentence,  after which he disappeared forever.

Or did he?

For more about Black Bart, an article exists on  Wikipedia.