Step 1: Buy a 30-day Time Card on Blizzard Store
Step 2: Contact the person whose account you want banned. Tell him that you are quitting WoW and giving away a 30-day time card code. He will in all likelihood use the code.
Step 3) Contact your Credit Card company and report your CC stolen.
Step 4) Blizzard will ban the guy who used the time card after the CC company informs Blizzard that it was purchased with a stolen Credit Card. Marcus Eikenberry of Markeedragon confirms this:
[ame=http://www.youtube.com/watch?v=N233BsmI2_g]YouTube - WoW scam that will get your account suspended. Don't fall victim![/ame]