IMO's autopilot'ss scariest incident is where it drove into a barrier between the exit lane and the highway. https://gizmodo.com/tesla-autopilot-malfunction-caused-crash...
Other drivers were able to reproduce the same behavior, in which the car appears to think that the space between the exit and the highway is a traffic lane that it should follow. This will dump you straight into a wall at highway speeds. https://www.youtube.com/watch?v=VVJSjeHDvfY&feature=youtu.be...
Tesla fixed it. Then six months later the same behavior is back: https://www.reddit.com/r/teslamotors/comments/b36x27/its_bac...
How do you trust a system like this when any software update could turn the car suicidal with you in it? Yeah, it's also incidents where it saved drivers from a collision with faster than human reflexes, which is great. But you still need hands on the wheel and constant attentiveness or it might kill you in a situation that would be obvious to a human driver. The full self driving dream is further off than Musk will admit.