In the movie you are certain that this is not happening. In the roulette your mind actually thinks that you won. When you win $500 in the roulette you think you

In the movie you are certain that this is not happening. In the roulette your mind actually thinks that you won. When you win $500 in the roulette you think you have won whereas you actually lost money by playing and you are riding some random fluctuations. Few people can intuitively understand the concept that when you win money at the roulette you actually lost $0.2 per spin in a $1 roulette multiplied by the times you spinned.