One of the greatest joys of tennis is having a nice volley and not really keeping score, not really looking at the lines, but just catching up with each other.
There comes a certain point in life when you have to stop blaming other people for how you feel or the misfortunes in your life. You can't go through life obsessing about what might have been.
You're over there in the corner either thinking about the dead dog or whatever, you're bringing up your personal life and you need the space, and then somebody throws you a joke. Especially if it's an emotional scene, you don't want the joke.