http://www.digitaljournal.com/article/87193

Biggest Nascar Crash In History

Posted Jan 7, 2007 by Rumble

http://www.metacafe.com/watch/367106/biggest_nascar_crash_in_history/

Classic clip. 37 cars mashed together. You've got to love the commentary, "The most fantastic pile up in racing history!"
This was in 1960 during the second ever Daytona 500 at the Daytona International Speedway at Daytona Beach, Florida.