When my day is full of actions :D I will post my experience here !
If someone annoyed you don't blame him on time, think for a minute may be he didn't mean it and may be you're not in mood to get what he meant.
People are different, that's what we call diversity ! everybody is unique on his own style.
Don't expect the same reaction from more than one person, remember uniqueness issue ;).
When you're angry close your mouth, you will regret later each idiot letter you spoke.
You aren't an angel nor me, when you find someone who can understand your mistakes don't let go.
Never build your life on probabilities, stay factual as long as you can.
Your dream belongs to you, inside it you see what you want to see, don't let it affect your real life so much.
When absent person is involved in your speech, say something good or keep silent.
Try not to regret so much.
Don't make the same mistake twice, there're more you could try.