Mythbusters is one of my favorite shows, and it always seems so safe.  But this video shows just how are that cannonball got out of hand from the bomb range.

Two California families are lucky to be alive  after a "Mythbusters" experiment went horribly awry yesterday sending a cannonball careening through their homes, leaving  holes in its wake.

Sgt. JD Nelson from the Alameda County Sheriff's Department says hosts Jamie Hyneman and Adam Savage were trying to figure out how effective a cannon is at firing non-cannonball objects ... but first, they had to test the cannonball itself.

The cannonball was supposed to land harmlessly in a nearby hill -- but something went wrong ... and the ball,  traveling at about 1000 ft/s, went over the hill bordering Camp Parks Military Firing Reservation, and into the neighboring town of Dublin, crashing through two separate houses before finally coming to rest ... inside someone's minivan.

The Discovery Channel show has been put on hold after the mishap, pending a full investigation. Luckily, no one was injured.