Whats the most you spent on junk?

My first Dart a 1972 Swinger that was running, I drove it home. Started taking it apart to see how bad it was. Time I got to the fame and couldn't lift it by the rails because they were rotted through, I gave up on it. Paid $2000 sold it for parts and ended up with $750.
I was spooked about this exact situation a buddy of mine paid 4000 for a project charger that had EXPANDING FOAM i. the frame to cover rust holes. I went under my car and poked the frame and floor pans with a screw driver to make sure i hadnt gotten duped.