here's one that i've always liked:
a farmer has a fox, a chicken, and a bag of grain. he needs to cross a river, and his boat will only hold him plus one item. if he leaves the fox alone with the chicken, the fox will eat the chicken, and likewise the chicken and grain. assume that none of the items will float or swim. everything must cross in the boat. and no, he can't leave anything behind.
There's a variation on this riddle in Broken Sword 3 <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
This original riddle, I've also played a long time ago on an Apple Macintosh Classic II - you could actually SEE the boat and the chicken and the fox and the grain... Amazing!
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