If you read the book For White People who Teach in the Hood Chris Emdin did this during his first class he taught at Harvard. Everyone in the class was doing the "10 minute countdown" until they could bail on the class. Hilarity.
I looked it up - I'm slow on mobile - and his last name is Emdin. Here's the book http://www.amazon.com/White-Folks-Teach-Hood-Rest-ebook/dp/B00Z3E2LVO/ref=sr_1_1?s=books&ie=UTF8&qid=1455904288&sr=1-1&keywords=christopher+emdin I will give it a shot!