I was going through a few boxes in my storage unit last week and came across and old gem from the 60's (I believe).
Bandai Jaguar XKE
Not mine but that's what it looks like. It's an old Japanese brand made out of tin and comes with a friction drive. Apparently one of these in mint condition with the original box can fetch for over $10,000. Mine, however, has no box, has a busted friction drive and has dents from being played with.
I know I had fun playing with it as a kid, but god damn... if someone had told me it would be worth a shit load of money when I was younger, I would have made my parents place it in a lock box at the bank.