if you roll the window down, then it's definatly your responsibilty, and even if it was already donw adn you see eeveryone else rollign their windows up you should do it too, or at least ask. i think if you don't have automatic windows then you should definatly roll it up, cause it's hard for hte driver to lean over and roll it up. but we always check the windows and locks on the car before we get out of our car.