Booms???

As I sat down to my computer I heard a loud boom. At first I wondered what Ariana had done. I think this is a natural thing to think considering her tack for getting into to things. However, I quickly realized that it was too loud for Ariana and I ran outside. The neighbors were all outside as well. We are all wondering what the noise was. Part of me is terrified at what could make such a loud noise and the other part of me is grateful that it wasn't my kids. Is that wrong?