Dare you to walk in the Graveyard at night!
I dare you to hug the next person you see!
Dare you to log off?
Drink gasoline, but not enough to kill you. Drink some oil, too.
Post a video to youtube, and prove it's you. Like, state in the video "I am grasshopper831" and then drink gasoline and oil, and give us the link to the video.