My husband has an enviable ability to rationalise anything that comes his way so that he is rarely stressed, and just doesn't worry about the small things (I don't think he worries about the big things either). He absolutely takes on board the notion that if he can't fix it, then he won't worry about it either. He rarely gets mad, and has a great inner calm. I twanged his car once (although it wasn't really my fault), when I told him he didn't get cross or mad, he just cared that I was ok. I wish I were as calm as him.