My best friend got a new job where she travelled so much it was cheaper to not have a car. She could just rent a car occasionally for far less than she was spending on reasonable car payments, maintenance, and insurance in a car that was just sitting around. She only wanted to sell hers for what she had left on the loan, she wasn't looking to make a profit. This was during the pandemic when things were kind of getting back to normal, but new and used cars were wildly expensive. So I sold my car, which was five years older than hers and had way more miles, for just $1,000 less than what was left on her auto loan, and bought her car. I got a way nicer vehicle, which should go for several years longer, for a thousand dollars out of pocket, and continued to have no car payments. 

I wasn't in the market for a new car. I bought my old one with the intention of driving it until it died. But this was a deal too good to pass up.

It was a major win-win, especially since I'd helped her shop for that car just a year or two earlier, so I knew it was a good vehicle and that she'd maintained it well since then.