Odd couple noun phrase
A extremely unlikely or mismatched pair of people.
It is said that they are an odd couple, but they don't care about that.
I think that Jack and Rose are an odd couple. They are apples and oranges.
Something that is impossible to happen, to achieve, or to be done.
To indicate a pair of people or things as in tandem
To make a promise that cannot be kept.
People are always inclined to flatter or please a rich man by laughing at his joke which may not be a very good one.
Everyone at the table always flatter the boss by praising his humor. A rich man's jokes are always funny.