My wife and I had the recent experience of buying both a used car and a new car. In both cases, it was a horrible experience that seemed intentional by the dealer.
When we purchased a new car, we knew exactly what we wanted. We had very severe limitations based on the size of our garage, so we basically walked into the dealer knowing what we would buy, as long as we liked the test drive.
Related: Amazon makes surprising decision to cut losses on recent deal
After we drove the car, we told the salesman what we wanted, the color and some other minor things and offered to start to the paperwork process. He said that wasn't necessary and would call us when the car arrived.
He did, and again we offered to start doing any paperwork needed. We weren't financing the car and, in theory, picking