The curse of the clevage has haunted mankind since the dawn of low cut tops. When your looking through a crowd and suddenly 'WHACK' there's clevage! And even if you don't mean to you cant help but stare just for a second which is just long enough for the holder of the clevage to clock you and then your buggered. For help look up bonzo.
(Looking for someone in a crowd, panning across 'Woopah' theres clevage, pause for a second, realise look away quickly, be ashamed of yourself. (its not your fault)