The Courtesy of Crashing

We arrive at the four-way-stop. Each of us assess the vehicular situation by looking at all sides. After a quick glance around the area before and after stopping behind the white line, you know which order the cars will accellerate in. Excited, you go second, after the white van to the right who was here before you even arrived. The other cars have only just arrived. You creep forward while keeping an eye on the blue car to the left. "ah, an understanding, I can go." You speed forward a few feet and around that time the blue car decides that it's hammertime and that his turn must take place while your car is in front of his.