Have you ever turned down an offer for you car that was too good to refuse?

there are a couple Ive sold for less than I should have and still regret. I'd be lying if I said i hadn't gotten attached to a couple along the way that became sentimental, and ended up selling them out of circumstance. I have a car now that I'm actually attached to and I would probably sell for the right price but it would have to cover the man hours I have in it plus the value of the car lol.