If I can't seem to decide between A or B, I flip a coin. If, in doing so, the answer is A, one of three things happens: I find I like the answer, and it turns out it was my preference all along. I find I prefer B after all, and just didn't realize it. Or, I really don't care in which case the coin flip was as good an answer as any I could've come to.
The coin didn't tell me anything. But by forcing a decision it revealed something I didn't consciously understand.