Fiona has obsessive-compulsive disorder. She has many intrusive thoughts, but the most frightening is that when using a sharp knife, she loses control and stabs her son, severely injuring or perhaps even killing him. Fiona loves her son and is a good mother. She is horrified about these thoughts and does not want to act on them. Yet she is so afraid that she will lose control that she has taken all the knives out of the house (including the butter knives). She has also removed all the scissors. She made an appointment to see a psychologist, but she is worried. What if the psychologist thinks she is crazy?