Passed on an absolutely mint '69 Shelby GT500 convertible, 428, 4 speed, gulfstream aqua, white interior, white top. $4,500 was all the money in the world in 1974.
Passed on a '62 Corvette, 327/340, 4 speed, Honduras Maroon with black interior and hardtop. Looked like the day it rolled off the assembly line. $5,500 around 1977 or so. Single guy with uncashed paychecks in my wallet. Didn't want to borrow the money to buy the car.
Traded my '70 GTO 4 speed convertible for $1,800 towards the purchase of a brand new '75 Pontica Astre.
Woulda, coulda, shoulda . . . excuse me while I go hurl.