1) The immaculate Lancia Scorpion that I 'owned' for about three days, reselling it to my uncle so my newly licensed cousin could drive it, who decided it wasn't 'trendy' enough for her geographical location, who sold it a couple of months later. And no one told me until the car was long gone. I would have bought it back.
2) The Fiat Dino Spider my dad came across in 1987, also in great shape. He owned an auto body shop at the time, and would restore random cars on the side. It was cheap, relatively speaking. When the Ferrari market starting getting out of control in 1989 or so, Dino prices were dragged along. I could have made a small killing on it, at least payed for a year of college or two.
3) The SVO. A different car in a sea of cookie cutters. Turbos were disposable back then, like oil filters, but I liked it.