What stuff have you found in your cars from previous owners?

In the barracuda not nearly as much as I would have expected as the PO was the original owner so it had seen a lot of time/miles,

28 Pens
1 Steak Knife
1 AAA Membership from 1971
1 Notebook with random schematics, (PO was an Electrical Engineer)

oh and a street sign instead of a drivers side floor...