Be sure to check out some of their breakdown of torture devices.
A number of medieval torture devices have the word "Spanish" attached to it, but this one is probably the most gruesome. The Spanish Donkey gave victims an unimaginably horrible ride, and here's why. Victims are put astride, naked, the apparatus, which is actually a vertical wood board with a sharp V-shape wedge on top. Varying weights are then attached to their feet. Eventually, the victim's own weight and the extra baggage cause the wedge to slice through their bodies, splitting them in half. Yikes.
Enjoy your nightmares!