People feel really angry when they sense that they or someone they care about has been offended, when they are certain about the nature and cause of the angering event, when they are convinced someone else is responsible, and when they feel they can still influence the situation or cope with it. For instance, if a person's car is damaged, they will feel angry if someone else did it (e.g. another driver rear-ended it), but will feel sadness instead if it was caused by situational forces (e.g. a hailstorm) or guilt and shame if they were personally responsible (e.g. he crashed into a wall out of momentary carelessness). Psychotherapist Michael C. Graham defines anger in terms of our expectations and assumptions about the world. Graham states anger almost always results when we are caught up "...expecting the world to be different than it is".