Why the long face?

When you ask someone this, you are asking someone why they appear to be sad, depressed or upset in a way that is sometimes not very sympathetic.

1. What's with the long face David? I told you that she would break your heart!

2. In the world cup finals the fans of the losing team always have long faces.

3. What's with the long face? Have you failed your chemistry exam again?

4. The English reporters had long faces when England lost the bid for the 2018 world cup to Russia. (Please don't take offense! Just an observation.)