What about a $41,000+ win on a penny slot bonus round? This is a huge slot win for a $10.00 max bet on a Butterfly Kiss penny machine. Oct 4th 2013. The winner was crazy-calm but maybe she was just in shock. Fun to watch as it happens. I've never tried this machine but will look for it from now on, that's for sure. It just looks like the bonus round is a lot of fun. Bonus rounds are what keep the penny slots relevant.