You have given a right example because when we play UNO the game might get change unexpectedly and you get more cards in hand when u are about to win and get frustrated, but then again you just need to control you mind and don't give up the game and just play you might get win. The conclusion is don't judge and give up whatever the unexpected situation is.!
One never knows what life might hand out, much like a game of chance like Uno...it's good to understand that and to know how to work around it.