The odds of flopping AAA is the same, even if the flop of the last hand was also AAA.
But, remember that fish have terrible short-term memories, and usually only remember the last hand. That means the action of the previous hand can have a huge effect on the current one. If you won a pot last hand without showdown, the fish assume you bluff every hand. If you folded to a raise last hand, the fish assume that a big enough bet will knock you off every hand.
So, the cards are still random, but the play isn't.