Probably shouldn't mention this, but there was a segment on public radio about serrano ham slicing injuries. It was a very common thing in the Spanish emergency rooms (over 60,000 a year!). The men take great pride in getting a thin slice and concentrate on the ham and knife edge. The totally forget about their other hand. The off hand's thumb was the common injury.
Here's an article on how to cut a serrano ham
that mentions these injuries and how to avoid them. It might come in handy when cutting your prosciutto. (I'm a huge fan of the San Daniele style).