This is what I have for a first paragraph of my novel.
I heard the gunshot, but I didn’t know what it was. It really did sound like a car backfiring. My other thought was that of the neighbourhood kids playing with a cap gun, like I did as a child. I dismissed it. Perhaps I didn’t even think enough of it to dismiss it. I live in a nice neighbourhood. That simple, brief sound, only registered as background noise. I was too focused on my own little world.