No kidding Gene!
Case in point "what was I thinking".........window regulators. Way back before I had my wagon and just owned a 4dr, I picked up a wrecked but very low mileage '73 4dr for parts. For whatever reason, I saved ALL the window regulators. Why? 20+ years later, I don't know if I have all the pieces anymore and don't know why I still even have them.
Screws and bolts almost fall into that category too. I betcha if I gathered up all that I have saved off of different vehicles I could easily fill a 5 gallon bucket, maybe even two.
None of the car parts spill over into the house thankfully.
Personal effects (clothes, furniture, etc) two truck loads max.