For a long time, many years ago, I could not pass a one-armed bandit without giving it my last coin (I'm going back to the days when you used to put 6d in the slot and pull the handle). It was only later when they became electronic and then computerised that I realised that there was nothing random about them. If it is ready to pay out then it will do so, regardless of how you play. I once had three triple bars on a four reel machine with the option of a hold for the fourth bar giving a £100 jackpot. In a show of bravado, and to the amazement of the onlookers, I declined the option of a hold and respun all four reels. Surely enough, as I had anticipated, all four triple bars clicked into the frame on the next spin and I duly collected. The machine was ready to drop the jackpot and would not be deterred by my unorthodox way of playing. Shortly afterwards, and for no explicable reason, I totally lost interest and now wouldn't give one a second glance. They can be addictive - if I could reclaim every penny I fed into a slot machine between 1965 and 1985 I would be a very rich man.