I believe my back window broke because the trunk on my ford focus always shut hard. My dealer in tn. will not pay 1 cent to have it fixed. I have bought 2 new cars at that dealer. Talk about not standing behind their product. My car is a 2007 ford focus I bought it new 8 months ago. Ive always had to shut the trunk hard because it would look shut but wouldn't be. I think it started with a stress fracture and finally shattered. The dealer called someone and they said there was no other problems like this, so it was my problem. I think ford motor is responsible and should pay the $500 to have it fixed.