How can I completely and utterly destroy the human race in less than a year?

Do away with yourself first and you won't see anyone.

I need to know by friday...

Shut down the internet it will drive them nuts they will kill each other

Play ONLY Justin Beiber music over the airwaves, nonstop. That will drive the world insane and will lead to self destruction.

Bottom line is: YOU can't.

If there really was a way:

A) somebody smarter than you would have tried it already;

and B) if we knew the answer, none of us would tell you what it is.

You can't cos I said so :/

I'm scared :/

Steal all the phone chargers in the universe.  People will soon go into withdrawal and will self-destruct within hours.

Watch and learn....