Obscure twenty-five-cent words, wasting valuable work time, and feeding the hungry? Free Rice is three of our favorite things, in one convenient website! Idly test your vocabulary, and for every one you get right, ten grains of rice are donated to the United Nations World Food Program. Waste a couple hours on the job, and you can help someone else's economy while undermining your own! Now, if you'll excuse me, I'm off to work larboard and clapperclaw into my everyday conversation.
(Thanks to Lisa at Exploding Aardvark for finding this one.)