Sometimes things are going to go wrong. It is just a fact of life, and because it is a fact of life it is a fact of story, of games, and of almost every thing that we as humans do for entertainment. Sometimes things go wrong. Sometimes you go to do something routine and it becomes a horrible botch of a job.
The important thing to remember though is that things don't always go wrong, and even when things are going wrong it isn't 100% of the stuff going wrong. Something is still going right. Something is still there to be gleaned from the situation. You just have to look for it, to find it and grab it and pull it to yourself.
Sometimes things go wrong. How we deal with matters when they go wrong is what defines us. It is what makes our characters interesting. It is what makes the characters we watch, read about, talk about interesting. Who wants to hear about a person that flips out or breaks down when things go wrong? People who do that are a dime a dozen. No, we want the people who step up and shine when things go wrong.
Sometimes things go wrong. It is something to accept. Sometimes the dice just aren't on your side. Nothing seems to go your way. Your friend is lying on the ground bleeding out and your left to deal with the three armed thugs on your own. Sometimes it sucks.
Sometimes things go wrong. If it is in a game understand that sometimes things have to go wrong. Nothing is always all peaches and roses. Sometimes luck will have to run out or turn bad. Sometimes things won't go the way you are hoping or want and there may be very little that you can do about it.
The question is: when things go wrong how will you deal with it? In game? Out of game? Will you get frustrated? Will you enjoy it? When things go wrong, what will you find out about yourself, your characters, and your game?