Here's something that might keep you busy for a while. Robin Words pits your language skills against a computer.

Change one letter in the four-letter word the computer gives you. The computer will then change one letter in the word you used and so on. You may not use proper nouns or reuse words that have already been used. The first person to use up all possible words wins!

Some people brag of beating the computer fairly quickly, but it depends on the word you're dealt. Others complain that the computer arbitrarily rules your words ineligible. How are you doing? Link -via mental_floss