Charlie: Well, Jen, I guess that I have learned, in my vast experience, people tend to feel low energy on Monday mornings.
Jen: And why is that, exactly?
Charlie: Because generally they have gone out on the weekend and done something that they regret.
Jen: Or not done something they regret. It is possible, you will agree with me here, that you feel more regretful for the things that you haven't done than the thing you have.
