What stuff have you found in your cars from previous owners?
Found a nice needle nose pliers that was causing the rattle in the dash of my '79 Lebaron. Looked like it had been there from the factory! I once bought a '76 Valiant that only had 16,000 miles on it, but had sat in a pasture for years. I pulled 9 dead mouse carcasses out of the headliner alone! It took LOTS of Pine-sol to make that one drive-able again!