You have to have the right mind set.Decide you are going to go with the flow. Don't get upset by the little things, life is too short. It takes practice. Yesterday I lost my checkbook. I didn't get upset. Right now it's sitting down at the Walmart waiting for me to come get it. Think positive and as Alfred E. Newman said, "What me Worry?" (mad magazine)
Our friend patriciashoup Checkbook example is very nice. we do not lost anything...things either wait for us or they will help to other people who are in need more than us. !
We usually give more importance to our things,ideas and concepts and we started beliving they are great (simply because they are our OWN thoughts) . This Ego will tell others are wrong and they are not upto the mark and EGO wont allow us understand a point other people have their own Views. and we start gettting irritate. "We are not Univerese, we are part of the universe and sharing the space with everything" . If You clearly understand Everything (checkbook) or Everyone (your superior or subordinate in office) have their own LIFE and own openions and they also have FREEDOM(just like you).
From that understanding Peace may come (if your Ego wont object other people freedom)