One day in college, a friend and I decided to pack a plastic bottle with dry ice and hot water. In our hung over state, we thought this would be fun to watch. I was in my apartment. It took all of five seconds to realize that I couldn't rip apart the bottle. So, if the force of this explosion was sufficient to do so, it was probably really fucking dangerous. I figured it was too late to take the cap off -- the bottle was already making weird sounds. So, I threw it in the bathroom tub, and shut the door. Two minutes went by, and I felt momentarily foolish. Almost as I thought "nothing is going to happen," it exploded. The force knocked my friend to the ground. Granted she was tiny, and it was partly from fear, but I felt the shock wave rattle my bones.
I lived in the more expensive apartment building on campus. No one even came to say, "what's going on." If they did, they would have seen the bent metal of the tub's faucet.
And, that was accidentally but very literally a bomb.