I had a slam fire in a Glock .40. It apparently had a high primer. I was in the garage, and had just cleaned the weapon. I was chambering a round when "BANG," it went off. My finger was no where near the trigger, and the ejected spent case had not the slightest indentation. It looked like an unfired primer. Fortunately I had it pointed is a safe direction. The bullet went through the grage wall and out into about 1000 acres of farmland.

Scared the cr@p out of me, though. Scared my wife (who was in the house) worse!