Funny Bone Remover

What has now come to be seen as a dark and terrible artifact was once a simple medical device, used by an ancient civilisation during their mummification process. It was designed to remove the internal organs of the deceased before embalming with great precision and minimal mess. It is a rather complicated looking clockwork device, with sharp rotating blades, razor edged scalpels and several clawed appendages of varying sizes. Other than the small thaumaturgy crystal which powered it, there was nothing magical about the device, although the secrets of its crafting are lost to time.
Bad pun guy, using yet more of the dark arts modified the device to suit a different purpose. They had heard of this strange thing called a funny bone, which the people of this age seemed to posses, and decided they needed to learn the secrets of this bone for themselves. Being a thousand year old mummy, no body seemed to find them funny any more, and they were desperate to discover the secrets of humour in this new modern age. Being a thousand year old mummy also meant they entirely misunderstood the concept of a funny bone, and took it a tad too literally.
The device once activated must fullfil its objective. Since the funny bone as an actual physical entity does not actually exist, the device simply extrapolated this to something slightly more tangible, and removes the persons sense of humour. This was somewhat skewed by the perception of the person who modified the device, who as earlier stated had completely misunderstood the concept of a funny bone. Also they were using the dark arts, those ones black as the void, and well they are known to be evil for a reason, and those reasons are often their own.
Those who have been on the receiving end of this terrible device, are never the same again. They spend the rest of their lives never getting jokes, unable to laugh at silly mishaps, and finding no joy in clowns (although this latter is not the reserve of only those who have had their sense of humour extracted).