they found hundreds of rounds of ammunition in the rosemount drive home. the bomb unit disposed of two explosive devices. they took custody of two other bombs. >>> it was so bizarre it was almost not to be believed. the 30-pound cannonball blast your neighborhood can causing considerable damage. they confronted law enforcement and tim markovic tells us that they got an earful. >> i'm still amazed by the commonwealth doing what they did. >> sa executive producer of the show myth busters. >> it was an accident. >> explain that to these people. >> this with some of the damage left from the 30-pound softball sized cannonball. the myth busters team is doing an experiment at the alameda county bomb laden chip, intending to shoot it through water and all wall and into the hillside. >> is get off of the hill which they did not anticipate, not just once but twice. >> and into this neighborhood, getting another home and finally landing in this minivan a few hundred yards away. >> the reality is, this was not the freak accident, this was of foreseeable event. >> they