two halves of your face were knitted together in the womb and that brain of yours is a bit confused about which half should control which half of your body but your body couldn't care less when you smile both halves of your lips and brain operate in unison and not every smile is for happiness, you can read minds by the smile on some ones face, and sometimes its not at all pretty. our nose is situated just above our mouths that so we can smell the food before we eat it and know if it be rancid, and many people think its there simply random. Nothing in all creation is random, even throwing dice evens itself out, two halves of the same coin. Two halves of the same face. Inconsequential ramblings of a mind playing ping pong with itself.