So much epic fail especially when i was newbie, coz there's always a mistake when placing bets. Lmao and also a scenario that you already filled your bag coz you won many times but at the end of playing you suffered from losses that are very epic, to be honest. 
I guess most of us have gone through that experience when we were newbies thinking that we could always be lucky and continuously win. Instead of being contented with our winnings, we aimed for more because we weren't aware that we could still possibly lose more than our winnings in the end. That was a lesson that I've learned from the same experience, to know when to stop and not to be too greedy.