This is how the joke goes:
In shul Shabbos morning:
Nisht shabbos geredt but I have a 2005 Ford Taurus for sale, do you know anybody looking for a nice car?
Nisht shabbos geredt, how much are you asking?
Nisht Shabbos geredt, about 10,000.
At Shabbos mincha:
Nisht Shabbos geredt, I’ll give you 6,000.
Nisht Shabbos geredt, sorry, I sold it already.