Tricky Twins
You are trapped inside a room with no way out except two doors, one leads to you greatest fear, one leads to your greatest treasure.
Also inside of the room are two twins, one of the twins always lies, the other always tells the truth. Both twins know which door is which.
If you can only ask one of the twins one question, not knowing which twin is which, what question should you ask in order to escape the room. You can only enter one door.
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1 solution
To know which door leads to our greatest treasure, we want to ask a question that both twins will answer the same way, and tells us where the door is.
Using process of elimination (get rid of "Where is the closest restroom?") And then questions that don't meet the criteria above, the answer is "What would the other twin say is the correct door".
This works because the truth teller would tell us the wrong door because the lier would tell us answer lie. The lier would tell us the wrong door because the truth teller would tell the truth, but the lier would lie answer but it.
Either way, we are told the wrong door, so we can do the opposite and then be freed.