Not quite as crazy a question as it probably sounds.
How does the length of your ring finger compare with the length of your index finger?
Apparently this is something that's determined by exposure to testosterone, starting in the womb. And of course higher testosterone levels in the womb are also known first of all to sensitize certain areas of the body in a way which can lead to "male" type hair growth later on if they're exposed to testosterone in later life.
So here's the question -- is your ring finger longer than your index finger?