I don't really know if it was scripted or not, it seemed too cool to be just a random chance of luck. But anyways, I'll try to describe the situation as best I can. I was playing Saint's Row 2, and there was a chase sequence involving guns and fast cars. I had messed up and allowed the opponent to get pretty far, and I was certain I was going to lose the mission. I was approaching a T-intersection with high speed. Beyond the T-intersection was a steep hill with a walking path snaking along it. And it was a pretty steep, tall hill too, going downwards. Below the hill was another T-intersection, continuing straight forward.
Everyone get the picture? T-intersection, downwards hill, second T-intersection. So I drive towards the first T-intersection with max speed, just not caring about the mission anymore. My car bumps into something, I dunno whether it was the sidewalk or a small rock, and flies high into the air. My car is spinning forwards, doing like five flips during this brief moment of airtime, while the hill passes by me below. Then I land on all four wheels on the next intersection and continue driving as if nothing happened. I even completed the mission.
And it pisses me off immensely that there was no one to see it happen.