Called the fire dept who inspected the front and back, and found a break in the branch which I could not see.
While in the the kitchen we heard sliding on the roof and a crash, thinking "%%%! the chimney just fell!"
No...but thank God we had moved the cars and no one was in the back yard. The branch you see in the picture is about the size of two Corollas...and we had to play taps for the basket ball hoop.
As one of my relatives astutely put it "At least there are less leaves to rake this year" (yeh but I got a hell of a lot of acorns for the squirrels!!)