IQ Teaser #34
You have to interview 3 men. One always lies, one always tells the truth, and one always alternates in lying and telling the truth. Their names are Alex, Bob and Chris, and you ask them 1 question:

You: Which of you always lies?

Alex: I do.
Bob: Alex
Chris: Bob

Who is the liar, who always tells the truth, and who tells the truth half of the time?
Alex tells the truth, Bob lies, Chris is 50/50
Alex tells the truth, Bob is 50/50, Chris lies
Alex is 50/50, Bob lies, Chris tells the truth
Alex is 50/50, Bob tells the truth, Chris lies
Alex lies, Bob is 50/50, Chris tells the truth
Alex lies, Bob tells the truth, Chris is 50/50
None of the above

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