Back in the 90s, threre was a clever hack of Jolly Card poker machine in Europe. A Bulgarian team was able to put a single-chip computer into a car lock's remote. There is part of this poker game where after you get a winning hand, you can double up you winnings or lose it all in 10 rounds by guessing if the card drawn would be either red or black, or big or small. So, the person would sync up the computer timer with the poker machine after observing other people draws being red/black or big/small. After the computer successfully synces up, it will give a signal that it's ready and then you would always guess the card in this double down part of the game. Winning even the smallest hand and then allowing you to guess the next draws 10 times was enough to make you a lot of money. That device was sold at $10,000 a piece.