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Yes that is the one mine is a variation of. Rather than simply give the answer I'll give the analytical reasoning you need to apply to reach the answer. You know you will either get a lie or truth from either source. You know that each source is consistent to this end. So your only option is to guarantee that you will get both a lie and a true statement.
Another one that tricks the mind into jumping to a conclusion prematurely:
A guest in a price show is shown three closed lockets. He is informed that only one of the lockets contain the price and is asked to make a pick. After he has chosen the host opens one of the other lockets and reveals it to be empty. He then asks the guest if he wants to change his choice.
Which of the following is true
1) It is smartest to stick with his initial choice
2) It is smartest to switch his choice
3) It doesn't matter. The chance is equal
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[url]\"http://www.dsr.kvl.dk/~maddog/isur.jpg\" target=\"_blank\">Ooooookay. I surrender.</a><br />Sometimes I get the eerie feeling that my computer is operating me and not the other way around.
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