What is a specific example of how the Shellshock Bash vulnerability can be exploited?

I have read several articles ( article1 , article2 , article3 ) about the Shellshock Bash bug ( CVE-2014-6271 reported on September 24, 2014) and have a general understanding of what the vulnerability is and how it can be exploited. To better understand the consequences of the error, what is a simple and specific example of how some software might exploit the error?