Dr. Guillotine eventually ended up on the business end of his own invention.
Dr Guillotin was an opponent of the death penalty who proposed the use of the machine (which was not his own personal invention) as an interim measure for killing convicts humanely whilst the death penalty still existed. He was mortified when his name became associated with the killing machine which became the symbol of the French Revolutionary Terror.
Also, the Dr Guillotin in question didn’t die on the guillotine (he almost did, but was released when Robespierre fell from power) He died of old age in 1814. However, another Dr Guillotin from Lyons was guillotined during the Reign of Terror. Both of these events lead to the misconception the ‘The’ Dr Guillotin was executed by his own ‘invention’...
Dr. Guillotine eventually ended up on the business end of his own invention.
No he didn't. he died of natural causes in 1814
And he didn't invent it either.
The Halifax Gibbet 
was the means of execution in Halifax, Yorkshire from 1260 until 1650.
It was seen c.1560 by James Douglas, 4th Earl of Morton who introduced a similar device to Scotland as the Scottish Maiden 
which was used from 1564 until 1708
James Douglas WAS executed by means of the Maiden in 1581