Writer's Challenge #1: Cross-purposes.
As an exercise, to keep us all on our toes, I'd like to offer a challenge:
Write a one-page or shorter dialog in which two people each think they understand the other, but are talking about two entirely different things.
(Jean-Paul, you'll be good at this)
Feel free to open new threads for Writer's Challenge #2, #3, etc. -- I'd love to see this be a weekly or daily revolving exercise.