If you've got a lot to do today, you might want to click away now.
On the other hand, if you're always willing to sacrifice a little productivity for a few minutes (or hours) of awesomeness, I heartily endorse the latest, Harlem Shake Roulette.
If the phrase "Harlem Shake" means nothing to you, you have likely not been on the Internet or a college campus this month. For a crash course, simply put the phrase in YouTube and away you go. You should find an innumerable amount of 30-second clips that start with a single soul among many getting a little jiggy to the beat in a mask or helmet, and then halfway through the scene changes to, well... something else.
Or, automate the process by visiting Harlem Shake Roulette, a simple but addictive Web jukebox that shuffles through the best of the best.
Beware though, it's very difficult to look away once you start the Harlem Shake Roulette wheel a-spinning.
In fact, if you've only got 30 seconds to spare, I can save you the trouble. Harlem Shake Roulette has been spinning in the background of my life for some time now, and it doesn't get much better than this gem from the "Shaytards":