What they say: "With the greatest respect"

What they mean: I think you're wrong (or a fool)

What is understood: He's listening

What they say: "I would suggest.../Perhaps you would like to think about it.."

What they mean: This is an order, do it or be prepared to justify yourself..

What is understood: "Think about it but do as I want to"

What they say: "Interesting"

What they mean: Not interesting

What is understood: They are interested!

What they say: "Oh, by the way.."

What they mean: Main purpose of our discussion

What is understood: This is not an important item