What is something that really makes you angry?

Something that really makes me angry is when people act stupid. When they can't admit to what they did rong and that the outcome may have been their fault. It irritates me to see someone repeaditly admit when they are wrong and that they made misrtakes but if you can't do that than that just proves that your not mature. It makes me mad too when they lie to someone when they look them in the eyes. When their not sincere because worse than lieing to the person, your lieing about your feelings. That really gets me angry.