Brain Teasers for the Curious

Stroop's Test 


The first person to give me a CORRECT answer with work (YOU HAVE TO HAVE WORK WITH YOUR ANSWER!) will get a prize (probably candy or something to that effect, maybe bonus points?). 


Current brain teaser:

The Liar, The Truth Teller and The Random Answerer

There is a truth teller (always tells the truth), a liar (always lies), and one that sometimes answers truthfully and sometimes lies. Each man knows who is who. You may ask three yes or no question to determine who is who. Each time you ask a question, it must only be directed to one of the men (of your choice). You may ask the same question more than once, but of course it will count towards your total.
What are your questions and to whom will you ask them?