What's your favorite joke? Here's 500 That You Might've Missed

If you're reading this one at work, you might want to skip it, because a) you'll spend the next 2 hours reading it, and b) you'll end up laughing out loud at least a few times.
Over on The Dilbert Blog, Scott Adams has asked his active readers to post their favorite jokes. The result is About 500 really funny jokes. The one that made me laugh the loudest (so far):
"A guy is sitting at home when he hears a knock at the door. He opens the door and sees a snail on the porch. He picks up the snail and throws it as far as he can. Three years later, there's a knock on the door. He opens it and sees the same snail. The snail looks up and says 'What the hell was that all about?' "