Lots of superstitions seem to feature a sort of 'if X, then Y' sort of thinking, linking two unrelated things (If you break a mirror, you have bad luck for seven years) as well as taking nonsensical actions in order to prevent disaster (if you knock on wood three times after saying something aloud, you can prevent a 'jinx'). I've noticed that these lines of thought seem similar to those that occur within people who have been diagnosed with obessive compulsive disorder. How is thinking that knocking on wood three times in order to prevent a jinx different than thinking you have to walk around your house three times to prevent it from catching fire while you sleep? 

I assume that the separation must be more than just 'one is commonly accepted'. Is it simply that in order to be diagnosed OCD, it has to have a profound negative impact on one's life? Is an obsession with these sort of superstitions a sign of OCD?

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