This urban legend has been around for almost 20 years now - the idea that if you watch the movie "The Wizard of Oz" with the audio off, and then play Pink Floyd's "Dark Side of the Moon" as the soundtrack, that the music and visuals from the movie magically synchronize. Rather than trying to time this perfectly with your home theater system, you can now watch this effect on YouTube, in its entirety.
It's tough to pinpoint some exact moments where the synchronization appears, but I suppose with enough alcohol or other substances (kids, don't do drugs!), you can fill in a lot of the gaps.
[Via the fine folks at Reddit]
Keith Shaw rounds up the best in geek video in his ITworld.tv blog. Follow Keith on Twitter at @shawkeith. For the latest IT news, analysis and how-tos, follow ITworld on Twitter, Facebook, and Google+.