Go to any pub in the UK and you'll hear the familiar sound of coins dropping into a fruit machine. These are the most popular gambling device in the whole country. You'll also find that many veteran players believe that they can tell when a fruit machine jackpot is about to spree. Over the years, they have honed their listening and watching skills to be in tune with the fruit machines. Small, almost insignificant sounds and signals to tell their expert ears and eyes, that the jackpot is near.