I guess not every does that, or the world would probably be a much more pleasant place, but I try every day to let the bad things of that day leave with that day and just let them go. Of course, I'm only human, and very often annoyances and hurt feelings will continue on into new days, but I really do try to let the things that I know won't matter once I forget about them go.
Like if someone is upset at me because of something that I can't control, I try to let it go. I try not to dwell on gossip and bad feelings because I remember what it was like to be in a job that made me want to cry every single day I worked there, and part of the reason for that is because I let everything get to me. Even making less money know, I'm so much happier and less stressed out.
I'm genuinely curious, so please, comment away.