[samatman]

I've taken to calling that the gambler's fallacy fallacy: the misapprehension that a randomness can only arise in situations where the events are uncorrelated. The randomness in Tetris is another good example: when you think you're due for an I, you actually are.

[andrepd]

Tetris actually uses two entirely different algorithms, one classic and one modern. Classic is randint(1,7), modern is shuffling "decks" of the 7 pieces and repeating.