1957 Plymouth Time Capsule
In 1957, to celebrate 'Tulsarama' the city of Tulsa sealed a 1957 Plymouth Belvedere in a time capsule. The Plymouth, along with other 1957 artifacts, will be unearthed from under the courthouse lawn in 2007. The car will be given to the person or next-of-kin of a contest back in '57 who correctly guessed the population of Tulsa in 2007.
I believe there is a similar contest in New Jersey where the winner gets an unearthed Chrysler Imperial with Jimmy Hoffa in the trunk.
Source: Jalopnik


