hack-tow rule of half
a law so strong that you and your best mate will do anything to split whatever food or drink is there exactly in half, even if it means you both end up with the worst part and your friend laughs at you
We split the last piece of cake and I got the crust and he got the filling
We split the last can of soda and I had to drink the dregs
We split the last pizza and I got the crust and he got the toppings