I have a theory that it is always 8 degrees hotter at the zoo than anywhere else on the planet.
I have a rule to not call anyone after 9pm unless it is a dire-and-extreme emergency. 8pm is the yellow zone.
I have a rule that the height of pigtails on the side of your head should be in direct relation to your age --- and the use of pigtails should cease and desist somewhere around 42. In other words: it's okay for babies to wear wee little piggies right on top of their adorable craniums, Bean wears hers right up high on her noggin, and I wear mine low down by my shoulders and will continue to do so until I reach the cut off age.
I have a rule that if your hair is long and starts getting all separated and pointy at the ends (visualize a sawtooth effect running along someone's back - I call it pointy hair and you can thank me later for that particular addition to your vocabulary), you should RUN not walk to the nearest hair stylist personage and GET IT CUT.
Tell me some of your theories and rules.