What are some the more idiotic and stupid mistakes that you know you shouldn't have made but did anyway. Yes this includes other none ga!nling stuff like sending btc to the wrong address. I'm interested to find out the stupid things other people do. 
I can't control my mind because feel of greed take it, and it makes lost my bitcoin but i get learning from it that i must focus in my mind that gambling is just for fun 
I think that's the operative word "control". Many people don't have control upon themselves when gambling, I know you're in the clouds when you win; however, when you are losing you are entering this agitated trance that keeps you on the table and in play because you want to get all your loses back in one swoop. That's how gambling works, winning or losing, it makes you want to play more, that would ultimately and actually amount to more loses in the long run. So, I think the worst mistake one could make is not recognizing their limit without view of their loses.