Impress your friends today with Tweet Forger, which allows you to create fake tweets from anyone you choose.
Just pick a Twitter user, come up with the text you want to forge, and and the site will create a unique page that is designed to appear just like a real tweet. (But don't worry - it doesn't actually hack into real-life Twitter streams.) Seconds later, a box will pop up to tell your friends that they've been had and what they are actually looking at is a forged tweet. Then they are invited to join the fun and start forging their own tweets.