When I cleaned out my wife's grandma's 1965 Ford Fairlane 500, I found 20+ year old French fries, ketchup packets, distributor rotors... 20 of them, still in boxes with 75 cent price tags on them.
I threw the fries on the ground and Odie, my Blue Heeler proceeded to eat every one of them. He left the ketchup packets alone, but he loves horse poop!
Along with the above mentioned, I found maps, pencils, matches and hair nets!
There was also a little book with all the maintenance records from new.