Unexpected Sunroof

Yesterday our car developed an unexpected sunroof. We have no idea how this happened. I even called the police department to see if there were any other broken windows in the neighborhood and there were none. When John slammed the car door it just popped and caved in. It did look kind of crackling that morning but we thought it was frost and didn't give it a second thought. We bought this car a few years ago from a High School girl whose parents wanted to buy her a SUV for college. It's been a great car until this year. In MO there is an inspection needed for license renewel that has to be passed. We had to fork out $1,000 in repairs to make it pass and to get the radiator flushed so we would have heat. It has over 150,000 miles on it. John asked the nice mechanic for his opinion on the life of the vehicle, he said it was a workhorse and should run a few more years. Looks like this horse kicked up her heals and hit herself in the rear. (window, that is)
We're replacing the window with one from a junkyard. This old horse better mind her manners. Whinnny!!!!!!