When the nuclear bomb is disabled, the timer stops. Nuclear bombs would be designed to detonate immediately upon loss of contact with timer. At worst, the timer would continue counting down and reach zero without setting off the bomb.
How could a few rocks disable a bomb in the first place? If you could disable it like that, there would be no need to know which color wire to cut, all you would have to do is hit the damn thing with a hammer.
OK, I just wanted to say if you listened to what Sharp says about the bomb being disabled. He DOESN'T say the bomb is disabled, he says the timer is disabled and someone has to stay behind to set the bomb off. The bomb was still running fine, the TIMER was not. Pay a little more attention people.
So what you are saying is that every time there is a fault with any of the nuclear devices in the world they should detonate. Can anybody else see the slight design flaw in that.
While broken tends to mean broken, whacking the hell out of a nuclear weapon with a blunt tool isn't a brilliant idea. While it will put your VCR out of its perpetual 12:00 misery, we must remember there are many things in the electronics of a detonator that we'd prefer not have a short at the wrong moment...and beating on it with a brick could do just that. So, theoretically, yes, you could just whomp it with a hammer to shut it off, but it'd be like juggling contact grenades: risky at best.