The March of History: Mises vs. Marx - The Definitive Capitalism vs. Socialism Rap Battle
Rap Battles, Keynes vs. Hayek: Fear the Boom and Bust & Fight of the Century (Round 2) - by EconTV
"Mankiw's 10 principles of economics, translated for the uninitiated" & Hyperinflation in Hell - by Yoram Bauman
Yoram Bauman's Funny Economics Articles: Many funny papers are listed here. You must see this page if you are really into econ. humor.
Here are some of my favorites:
"Japan’s Phillips Curve Looks Like Japan" by Gregor Smith PDF
"A Few Goodmen: Surname-Sharing Economist Coauthors" by Allen C. Goodman, Joshua Goodman, Lucas Goodman, Sarena Goodman PDF
“Chickens, Eggs, and Causality, or Which Came First?” by Walter N. Thurman and Mark E. Fisher, published in the American Journal of Agricultural Economics in 1988 Link
"The Economics of Faking Ecstasy" by Hugo M. Mialon, published in Economic Inquiry in 2012 Link
"The Theory of Interstellar Trade" by Paul Krugman, written in 1978 and published in Economic Inquiry in 2010 PDF
"An Option Value Problem from Seinfeld" by Avinash Dixit, published in Economic Inquiry in 2012 PDF
"Up or Down? A Male Economist’s Manifesto on the Toilet Seat Etiquette" by Jay Pil Choi, published in Economic Inquiry in 2011 PDF