Have I got a story for you about a Bad Retail Slave!
One time I bought a new Mustang, took it home and then got a call from the dealer.
I drove back up there and the finance guy said that he needed another $500 down to make the deal work.
I handed him the keys and said, "Keep the car. I expect a full refund. Now!"
He backtracked so hard I almost choked on the dust. He made a show of checking the file, then said, "Hold on... Oh, sorry, I got you confused with someone else." Then he lowered the price of the car 'for your trouble,' and we were on our way.
I was so mad. There was no reason for us to go back to the dealer. They just thought they could get an extra $500 out of us.
Every time I have bought a car, new or used, I have always felt dirty in the end.