>You have 12 billiard balls. All but one of the billiard balls are of equal weight. The one odd bal :) is either lighter or heavier. You do not know which. You have 3 (balance) scale weighings to determine not only which ball is the odd one but also whether it is lighter or heavier. You must be able to give logic for all possibilies.
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>Good Luck. :)

This is along same line of teaser as one I heard of 9 balls and 1 weighs slightly more but you only get to weigh 2 times. But in this one, not knowing whether ball is lighter of heavier makes solution more difficult. I'll have to think hard about this one.