Have you ever had a thought that just keeps popping up in your head? These kinds of thoughts can be images, phrases, even feelings that intrude upon an otherwise perfect moment. These intrusions are not hidden desires or even thoughts the sufferer wants to think. They just pop on in your head and terrify you. In Obsessive Compulsive Disorder they get stuck, and play on repeat in your mind. Because once isn't terrifying enough, let's play that thought again and again, and compulsively check if it is still there.
K.D. Holmes Blog