When I was in the midst of changing jobs several years ago I had to drive 2 hours one way for a piss test (just a ridiculous hoop they made me jump through). On the way back my 2001 Subaru Outback with 210,000 on it blew itself up. I had the job and it was starting in less than a week and I needed a car. Off to CL I went.
I'm a Subaru fan so I found another outback. Happened to be almost exactly the same edition I had, but in much better shape with far fewer miles. The seller worked at the local Subaru dealer and had had lots of work done to it recently that my mechanic friend confirmed. I talked him down 500 dollars, shook on it, then made plans to meet at the bank the next day. I was going to pay the loan he had out on the car in full, plus $300 cash.
Next day before we meet he reiterates to me via text the total amount I owed him (the loan + $300). Except in the total amount, which he didn't break down by category, there was an extra $100, as if we had agreed on $400 cash. I point this out to him and he disagrees saying we had shook on $400. Even though I needed the car this really had my blood boiling and I didn't contact him for another hour.
Prior to this he had let slip he needed to sell it because he needed money freed up to pay for other lines of credit he was upside down on (hahaha living above your means). Finally I texted him back "I was trying to be nice about it, but I know we shook on $300 and frankly it pisses me off that you're trying to trick me. I'm walking away."
I don't know how he had time to read it because he texted me back so fast begging I buy the car. So I did, but told him I'd only pay $200 cash. We met at the bank later and it's been a great car ever since.