http://en.wikipedia.org/wiki/Pen_spinning Wikipedia on the thing people do where they spin a pen around their fingers really fast.

http://www.thesmartset.com/article/article10240701.aspx Hitler's battle with flatulence.

http://mitpress.mit.edu/sicp/full-text/book/book.html The book Structure and Interpretation of Computer Programs by Gerald Sussman and Hal Abelson is available for free online. This was the introductory computer science textbook at MIT for several decades.

http://fretsonfire.sourceforge.net/ Frets on Fire is an open source clone of Guitar Hero. There are a lot of user created songs available for download on http://www.fretsonfire.net/forums.

http://www.metroidmetal.com/ Metal covers of songs from Metroid games.

http://www.youtube.com/watch?v=v3SANVFHIeE A commercial for Molson Canadian beer.

http://lolcode.com/home LOLCODE, the LOLcat programming language.

http://www.wired.com/special_multimedia/2007/1511_ff_manga The history of manga in America.

http://www.youtube.com/watch?v=ym0BtwmCvoc A Halo player gets fragged by a flying traffic cone.