Two friends are passing through Vegas and need to stay overnight in a hotel.
At evening, one friend is tired and goes sleep, the other one has 100$ bill in the pocket and wants to try his luck.
He goes to a casino and puts 100$ on red and wins 1,000$. He then puts these 1,000$ on red and wins 100,000$. He puts again on red and wins 1,000,000$. Lastly, he puts all on red and loses all.
Later, when he is back to his hotel room, his other friend asks: "how was at the casino?"
To that he replies: "Oh, I just lost 100$".