I’ve just found this remarkable CT scan in a 1997 article entitled ‘Trans-orbital penetrating head injury with a door key’.
The paper reports that “A 71-year-old-female was answering the door when she misjudged the step and fell forward impaling herself on the large key protruding from the lock.”
She was found with the key still embedded in her head and was transferred to neurosurgery where the key was removed.
Thankfully, the patient recovered with no neurological impairment and only slight difficulties with her vision.
Link to PubMed entry for the case report.
Mind Hacks 
That reminds me of the more recent story about the man who accidentally shot a nail into his head.
The link didn’t work on that, I’ll post it here:
http://www.msnbc.msn.com/id/25091319/
We had a lecture a couple of weeks a go from one of the profs in glasgow who used the radiograph for his “key points in summary” slide…