Etymology gets racist this episode. It's all about cake-related phrases: "Cakewalk", "Piece of Cake" and "You Can't Have Your Cake and Eat it Too". Plus the Unabomber!

Sources:
http://www.stuffyoushouldknow.com/blogs/cake-walk-the-strange-origin-of-an-unwittingly-prejudiced-term.htm
http://www.phrases.org.uk/meanings/piece-of-cake.html
http://www.nytimes.com/2011/02/20/magazine/20FOB-onlanguage-t.html

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Intro Music: https://animalmidnight.bandcamp.com/