The scene: New Year's Eve, Red Square, Moscow. The plot: A terrorist bombing in one of the biggest crowds on Earth. Method: A "Black Widow" suicide bomber will wander into the crowd; the brains of the operation watches, waiting for her to be in the perfect position for maximum lethality, then triggers the explosive vest via a message sent to the attached cell phone. The flaw: The device explodes prematurely, killing only the woman wearing it. The explanation: An error assembling the belt? No. A mistake by the bomb handler? No. So what went wrong?
A spam message from the phone company wishing their customers a Happy New Year triggered the bomb. Read more here.