Engine acts weird

Hi,

I would really appreciate any advise. I have taken a small video ( Please follow-up YouTube link ) that shows what has been happening to me recently.

Link : http://youtu.be/nVZDrP8iNZQ

Video taken today while I was in the parking lot, speed ( 20Km/h) , car suddenly stops and engine starts acting weird ( sound and RPM ), the RPM goes up and down, the engine sounds like a hover , car doesn't move anymore. Note that I was not pushing the gas pedal at all, even if i did the car won't move.

I was lucky since last time it happened on the high way ( same speed range while taking off a red light) and the car behind almost hit me.

As soon as I turn off the car, everything goes back to normal.

Do you have any idea what can be causing the problem?
I am no expert, I feel it is something related to the gas not going through well,due to the sound and RPM behavior, but why would the brake lights go on ?

Thanks a lot,