Circlocryogenic theory
(sur klo kri o JEN ik THE ur ree) Postulates that no matter which way you turn a glass of ice water, the cubes will to the back. (Further research has established t hat one piece of ice will always stick to the bottom of any empty glass until tapped, at which point it will come forward and smack the drinker on the end of his nose.)
source : Sniglets