Robinhood's prediction markets. This was Montreal/Carolina hockey game. Carolina scored 1st and gave an edge since these have been high scoring games. I chose Montreal on the idea they would score and close the odds to win gap/ I got in with a 25%... they wouldn't just score but go to overtime all the way up to 50% doubling our money. I got greedy thinking of the 100% win if they scored next. lessons learned.