I have met a lot of people who like to gamble and that's cool but a majority of them say they "know the secret" they can "beat the system" it's wild for so many people to think they can edge out the house or there is a system that hasn't been figured out and blocked yet.
Honestly if you're looking for odd's martingale roulette could be it and just always bet on one color but make sure you have a hell of a large bankroll to rock it.