Headless Horseman of Sleepy Hollow.
George Washington Allston Jenkins, oil on canvas, 1840 - 1865.

"But this was no time for petty fears; the goblin was hard on his haunches; and   (unskillful rider that he was!) he has much-ado to maintain his seat; sometimes   slipping on one side, and sometimes jolted on the high ridge of his horse's back   bone, with a violence that he verily feared would cleave him asunder"*
 

*[Washington Irving] The Sketch-Book of Geoffrey Crayon, Gent., 2 vols., London: John Murray, 2, pp. 405.