Via Michael M. Spear of Richmond University, this is a test featuring an allotment of the more obscure words of the English language. It's extremely difficult, but you'll feel all the more clever when you get an answer correct.
Well it's... Sand... and it falls.
Beyond the obvious, in this game four different colored streams of sand fall from the top of the screen, you can build walls to catch the sand or alter it's flow as you please, as well as some more advanced options found at the bottom. Reminiscent of the first time I came to posses an egg timer similar to an hour glass; mindlessly fascinating as well as relaxing.
One of the largest collections of descriptions of writing devices and examples thereof on the web. Here are a few pages to get you started:
This my dear readers is a jewel among jewels for a archive binge junkie; don't even touch this link if you don't at least have a couple hours and/or days to kill.
Webcomic, a favorite of mine, will probably take you less time than the previous links and is still hilarious.