Coco re-edited the original video to make things a little more like the horror that many people imagine it may be like to be in a car without any direct control. Imagine how often your navigation system is just a little bit wrong; now think about not being able to do anything to adjust for it. That's what makes the concept so scary.
If you're a cat fan, you might want to look away because computer-generated felines get the worst treatment here. Scroll down for a look at the autonomous prototype with a bit more pessimism and humor towards the future tech.