What is something that makes you angry?

The thing that makes me feel sad are insults. I hate to hear people giving insults either to me or to another person. It breaks my heart to hear such rude words and bad things about me coming out of a person's mouth. It does not only breaks my heart but other people's heart too. I recalled that I also had been saying insults to my younger sister. Ever since that day, I felt guilty and bad for insulting my younger sister. Even if I did insulted my younger sister, she still love me. I was relieved that she is not mad about me insulting her. In the future, I do not want to ever give an insult to anybody... unless I could not control myself!