Unlike most gambling means, slot machines have always been considered the most unpredictable ones. Perhaps, roulette is the only other example of a game that simply cannot be pre-calculated. So, it is not at all surprising that over a century of playing slots people have come up with a bunch of ways to cheat these machines. Some of their ideas were very simplistic, some others — pretty advanced. One thing is for sure, though: all of the tricks described below were unexpected, insightful, and — sometimes — even funny.