Check out this game (dragonfly over at Dreamwidth introduced it to me):
Akinator, the Web Genius. It's basically a 20 questions type of game where it tries to guess the person you're thinking of with 20 questions. It'll try up to twice more if it guesses wrong. It can be a little freaky - it guessed Oscar Goodman, Brian Boru, and Franny Crosby right away. Guessed C.S. Lewis and Betty Crocker (who, btw, does not look like the Betty Crocker I grew up with!) after 2 tries. Couldn't guess Luc Teyssier from French Kiss at all - twice! - even though the character's in the database. It guessed Jo March from Little Women the second time - but only after guessing Bloody Mary the first time.
If you have nothing to do (or don't want to do what you should be doing), it's fun.