I passed on a 1st gen covertible Camaro when I was 19, in 1990. Really straight, mild 327, it had been repainted, ran great and he wanted $3500 for it. Really nice car.My stupid pass was a 1991 Acura NSX with 69k in 2004 for under $25k. I instead bought a brand new WRX.
But gas prices had just gone up due to Saddam's invasion of Kuwait, and I wanted something that got good gas mileage, like 30 or more. Ugh. I bought an 86 Accord with a 5 speed for about $1000 more. It was a pretty good car, ran it out to 258,000 miles before selling it. In retrospect, probably the best decision at the time, but, sometimes I think about that Camaro.