I was 17, just out of high school, when the engine blew completely in my 1952 Chevy.
I'd paid local dealer Ray Fischer $200 for that car. He had a 1956 Chevy with 46,000 miles on it, totally cherry, 245 straight six engine, ran like new. He had it priced at $600. We talked, and he made me an offer: He'd take the '52 back in trade for the full $200 I'd paid him originally EVEN THOUGH THE CAR NOW HAD A BLOWN ENGINE, meaning he needed $400 cash for the '56 and it would be mine.
It was the best car deal I was ever offered throughout my entire life.
However, my parents nixed the deal. I had money in a savings account, mostly from money donated by my grandmother over the years, intended primarily to see me through college (which it did partially, but not all the way). I would have control of that money once I turned 18, but that wasn't until November.
There was no budging them, and I hated them for it. Still do to this day, and they've been dead for years now. I don't bring it up when I see them in the dream state, but I don't forget, either.
Over the years, I kept a very careful mental log of every "unnecessary repair" expense that had to go into the '52. (My parents wouldn't let me buy the newer car but did authorize $145 for a used engine out of a wrecking yard, and it went from there.) The "dollar loss" that most likely would NOT have hit with the '56 came to something over $2,000 in a 3 year period.
Let's see, y'all "saved" me from spending $400...and I only had to end up shelling out $2,000 for the privilege. Great economics there, Mom & Dad. Thanks a lot.