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Originally posted by KnightWulfeImpalement was [Vlad's] preferred method of torture and execution. His method of torture was a horse attached to each of the victim's legs as a sharpened stake was gradually forced into the body. The end of the stake was usually oiled, and care was taken that the stake not be too sharp; else the victim might die too rapidly from shock. Normally the stake was inserted into the body through the anus and was often forced through the body until it emerged from the mouth.
Details.
He would take a post - say about 4-6 inches in diameter, grease it down really good and slide it up the person's rectum, then stand the post up and "stake" it into the ground. The person would slowly and painfully slide down the post through the rectum and eventually die over a several day period of time.
Detailed enough for you?
http://en.wikipedia.org/wiki/Vlad_the_impaler