Gambler's fallacy

The Gambler's Fallacy is a wrong belief that if something happens often, then it is more likely to not happen the next time. This is wrong because each time something happens, it is just as likely to happen again as it was the first time. Say you toss a coin 4 times and it lands on heads each time. You might think the fifth time it will land on tails, but it's just as likely to land on heads as it was the first time.