Mythbusters experiment goes awry, sends cannonball through two houses 15 years ago
No one got hurt, and I'm sure they were careful. It's something they are always very clear about on the show... but eh someone/people genuinely could have been killed... so not quite all precautions were taken.
Also how amazing is it that the canonball burst through a front door and then went UP the stairs and out the back through the wall on the second floor?! Seriously. I didn't know canon balls would bounce/ react in that way... Kinda reminds me why I love Mythbusters...