im not saying you did what I did but I was able to duplicate this.... Follow my steps and you can do it toooo
-Step uno
Start your car and roll your windows down
-Step dos
with your key in your left hand(us cars only! for the smart a&* ppl on here haha)
-Step tres
turn the car off and then back on again and vuela its on with the no key inserted sign on...
I was able to start it about 2 times and then it woulnt do it anymore... quite possible you timed it right to get it to start like I did... what puzzles me is how you did it once and then was able to go get a camera and capture it knowing it was going to happen again.... Jus sayin