I think mine is possessed by the devil.
It ususally turns on, but if it doesn't, i honk the horn and then it will. Or sometimes i have to hit the high beams or turn the wipers on.
and it never turns off. Only when you switch the car off. (It does disengage, it just doesn't switch off)
Oh, and sometimes when i hit the high beams or dip them again, there is a momentary miss in the ignition. Don't ask me why.
Sorry for the hijack.