Yeah pretty sure that's fake and staged otherwise why would the LED blink if the capacitor wasn't charging and discharging constantly considering it was "hooked up wrong"
Often times it will work properly, for a little while until it explodes. It largely depends on a number of factors.
It reminds me of the first day of electronics class in high school. The teacher had a TV in a field that had backwards capacitors installed, and he said "Never give power to any circuit you make in this class until I've had a look at it. Since I know some of you aren't listening, go to the other side of the field and watch this. The set worked for around a minute until the capacitors popped.