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Found this one on the xkcd logic puzzle forum. I really like it.

## Puzzle

You are the most eligible bachelor in the kingdom, and as such the King has invited you to his castle so that you may choose one of his three daughters to marry. The eldest princess is honest and always tells the truth. The youngest princess is dishonest and always lies. The middle princess is mischievous and tells the truth sometimes and lies the rest of the time.

As you will be forever married to one of the princesses, you want to marry the eldest (truth-teller) or the youngest (liar) because at least you know where you stand with them.

The problem is that you cannot tell which sister is which just by their appearance, and the King will only grant you ONE yes or no question which you may only address to ONE of the sisters. What yes or no question can you ask which will ensure you do not marry the middle sister?

## Help

Hint
Although you might be able to solve this puzzle using a meta-question along the lines of "if I asked them what you would say if...", there is a simpler solution. Also, the question you ask can be something that all three sisters definitely know the true answer to.