Other than extreme dire circumstances, there's always a funny or positive spin you can put on all happenings. Even if you have to go for silly, it will lighten the mood and put a smile on someone's face.
Show your appreciation.
No one will know if you only assume they know. Speak your appreciation, give a hug or even a kiss. (Although a loving kiss may get you into trouble at the DMV office.)
Be on time.
If you are habitually late, it does nothing but show disrespect for others. You will not win friends or influence people. It's guaranteed to create negative reactions.
Don't waste time grieving over past mistakes.
Learn from them (often times that simply means not repeating them) and move on. As Tim of Oakdale Farm recently commented on one of my posts, " . . . it is most important to learn to roll with the punches and look ahead, not behind. What was, was. What is in the future is what could still be!" If we don't move on, we will forever be stuck where we are.