A sort of contradicting thing, but I guess I could describe it as a problem for which there is no solution until you actually solve it. Or maybe a problem for which the result of solving it is the solution itself. As an example (maybe not the greatest, but): "I need strength to get what I want, but what I want is what would give me strength". I might call it a conundrum, but I was wondering if there was a more specific word for it. EDIT: Thought I'd include this here. Dnaiel found a term for it.