Mine was on https://ace66.my/ during a Sugar Rush 1000 session, where the multiplier spots kept landing on the same cluster and the total kept climbing every tumble. I sat there not breathing for about ten seconds while it counted up, and my flatmate came in asking what was wrong with me. It wasn't even a massive win, but the way the round built up was genuinely thrilling. I still haven't matched that feeling since, though I keep trying on the same game.