Recently while inside our house my wife heard a loud "bang" in another room and upon investigating she found that one of our tempered sliding glass doors leading to our back yard had broken. The glass had completely "diced" at this point, but was still in place. The odd thing is that there was a hole (approx. 1/4" to 1/2") in the glass about one foot from the floor, and about three inches from the frame. The glass from this hole had shot 12 feet into our family room. I understand that tempered glass can spontaneously break, but under spontaneous breakage can a small piece get shot out this distance?