A: The house burned down.
B: What happened?
A: The man fell asleep.
B: Was he smoking?
A: Yes, he was smoking a cigarette.
B: Did he die?
A: Yes, he did. His cat died, too.
B: That's too bad. What about his smoke alarm?
A: The battery was dead.
B: A good battery would have saved his life.
A: He had cigarettes, but no battery.
B: It happens all the time.