~One of the things most people do not realize is that gambling can be potentially everywhere, so you do not have to stick to the classic games that everyone knows, on our school the most common bets could have been classified as sport bets, as we often competed to see who was the fastest or who could score the most points in a game, like most kids would, and once it ended you realized that your peers have been trying to predict the outcome of the competition and put money forward to support their point view, at the time I am sure that most of us did not thought about this as gambling, but now that I think about it, it is clear that it was.
Speaking about school days, I remember playing this game with coins: each of us classmates should hold some coins in the closed fist and the one who had more money in his fist took all the money from others, was shaking them in his closed palms and was throwing the coins on the windowsill. Then all the coins that were heads were his immediately and for other coins he should fight tossing them one by one onto the windowsill if they were heads he took them too. In the case of failing the turn would go to another player. The crazy bit was that it was forbidden to play such games in school.