Obsessive compulsive disorder: myths, causes and treatments :Most people have strange, intrusive thoughts. They can be embarrassing or completely irrational, so we don’t often talk about them. For some, however, these thoughts are impossible to stop, and can lead to Obsessive Compulsive Disorder. Lynne Malcolm and Olivia Willis report.

http://www.abc.net.au/radionational/programs/allinthemind/obsessive-compulsive-disorder-myths-causes-and-treatments/6587270