bad Temper

I do not know why I would get angry easily. My daughter asks me if she could play the puzzle I keep in study room just now. I told her she could play it but have to make sure would not loss the pieces. I already told her many times I would can them if lost any piece. Lost 1 piece will get 1 pat, 2 pieces will get 2 pets and so on. I do not know would this remind her not to loss any piece, since i already warned many times but still many pieces had lost.

Well, I hope my bad temper wouldn't go serious when they loss the pieces, else they will be in trouble already.