Nadia: Why are you doing that?
Dr. Gregory House: More important question is, why are you?
Nadia: It's just a habit.
Dr. Gregory House: It's a habit that compels you in an obsessive way that's so bad it's a disorder.
Nadia: I don't have OCD.
Dr. Robert Chase: Each brain with OCD has its own way of filtering it. Some people wash their hands and hoard TV Guides, you do puzzles and hoard memories.
Dr. Gregory House: So what we thought was a gift, was just you literally obsessing over your own life.
Nadia: That's why I can't stop the memories even when I try. But everything else? My kidneys...
Dr. Gregory House: Your memory was a symptom of a symptom of a larger disease. You have McLeod's syndrome. It's rare genetic disorder that affects the nervous system, blood and can cause OCD.
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From: House M.D.