Actually it was people simply hitting the wrong pedal, but yes to put the prius in neutral you need hold it in N for a moment, it doesn't simply go right into it. Also, pressing the ignition does nothing; it needs to be held for a moment. Still, slam the damn brakes should be number Fvcking 1 priority!
Lastly, this video is highly fishy. The guy accelerates and very, very quickly is into the next lane, like he was expecting it to happen. I simply think that's an unnatural reaction if your car really did start to speed up.
The car starts to accelerate at 6 seconds and as 7 seconds comes along he's already steering. I don't buy it.