Mythbusters is one of my favorite shows. It's very entertaining, yet scientific enough that one could rationalize it as being 'educational'. In addition to their CYA disclaimer at the start of every episode, they do a pretty fair job of documenting all the safety precautions they are taking to keep things safe and sane.
Accidents will happen though...and when you are trying to test myths involving a cannon that fires a 10 pound ball at over 1000 feet-per-second, your accidents can catch some attention. Especially when those cannon balls leave your 'experimental test facility(the Alameda County Sherrif's Department Bomb Range, where they have done many, MANY experiments) and punch through bedrooms and minivan's in the neighborhoods around the bomb range.
The good news here is that no one was hurt. It sounds like the cannon ball missed it's target(several barrels of water) and skipped up and over the berm behind their target. The show coveres insurance for just this reason(well, not this specific reason, but...you get it.)
The bad news is, this episode isn't going to be aired now! In typical knee-jerk overreaction fashion, the show's producers already said that this episode won't be shown. Lame!
The damage is already done...finish strong and cash in on the ratings you could get showing the hole you punched in this house!