Ever not been able to save a car?

i had a 70 coronet daily driver that i was going to take off the road and build. it had a little rust , but nothing major, so i bought a new driver. i started tearing down the coronet, and when i pulled up the carpet, i discovered the front half of the car was B5 blue and the rear half was burnt orange. it was actually 2 cars welded together at the floor seam and the roof A pillars. there were holes in the floor were the it had rusted at the welds. needless to say , that car got parted and scrapped. good thing i decided to take it off the road, it was border line dangerous.