whats the wierdest things you found in your car

In a 1959 Buick I had, I found a build sheet made from super thick paper with squares of options that, if the car had the option, the guy on the assembly line would punch his unique shaped punch through the paper to show it had the option. I thought this was normal until everyone on the '59 Buick forum went crazy about it. Turns out, there is no known build sheet that anyone had ever seen from a '59 Buick. And these guys knew everything about those cars. So apparently, it's the only one known to exist. I have since sold the car, but I kept the build sheet.