Man unknowingly fires 4-inch nail into head

The guy didn't notice the nail in his head. Seriously.

Be very, very careful with nail guns:

A dentist found the source of the toothache Patrick Lawler was complaining about on the roof of his mouth: a four-inch nail the construction worker had unknowingly embedded in his skull six days earlier. A nail gun backfired on Lawler, 23, on Jan. 6 while working in Breckenridge, a ski resort town in the central Colorado mountains. The tool sent a nail into a piece of wood nearby, but Lawler didn't realize a second nail had shot through his mouth, said his sister, Lisa Metcalse.

He was taken to a suburban Denver hospital, where he underwent a four-hour surgery. The nail had plunged 1 1/2 inches into his brain, barely missing his right eye, Metcalse said.

Mattsapundit's medical research department has discovered the medical instrument used to remove the nail.