Much much tougher brain teaser
Most OOTers are probably not smart enough to figure this one out on their own, but nonetheless, don't spoil it if you know it.
You have 12 rocks and a scale, and 11 of the rocks weigh exactly the same. The remaining rock is either heavier or lighter than the other 11.
Using the scale only 3 times, figure out which one of the rocks is the odd one out, and whether it is heavier or lighter.
You only get one chance, I am holding a .357 mag to your head, and if you screw up, I blow your brains out. Go!
-Matt
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