there's also a vent with a lid, mounted on the rear fender, under the bumper, that lets air escape right out of your hatch.

every time you slam your doors shut, you can hear the lid pop open and close. i imagine the lid is there to allow air pressure to release, so that your windows don't shatter when you close a door. i'm sure it also allows air to escape, when it expands from sitting in the sun.

i have heard of windshields "popping" from the heat though, but unless you live somewhere where it can get insanely hot and humid, someone must have smashed your window.