5. The Key to The Mystery

Now, this is really getting silly. This ´test´ involves the simple act of picking up a key. If you pick it up by the round end, then you're expecting a son. Maybe if you want a girl, picking the key up by the narrow end will make it change sex. Hmmm. Somehow I don´t think that'll work, and I can't see the connection between keys and babies anyway. Who thought up this sign you are having a boy? How did they come to this conclusion?