“Yes, Mr. Lee.” Superintendent Sugden did not wast time on explanations. “What’s all this?” - Agatha Christie

"He dragged me back - just in time. A tree had crashed down on to the side walk, just missing us. Poirot stared at it, pale and upset.
"It was a near thing that! But clumsy, all the same - for I had no suspicion - at least hardly any suspicion. Yes, but for my quick eyes, the eyes of a cat, Hercule Poirot might now be crushed out of existence - a terrible calamity for the world. And you, too, mon ami - though that would not be such a national catastrophe."
"Thank you," I said coldly."

Children and one's social inferiors never know when to say good-bye. One has to say it for them.

Well, of course, Gwenda dear, you can always do that when you've exhausted every other line of approach, but I always think myself it's better to examine the simplest and most commonplace explanations first.