Ever wonder how obsessive compulsives get that way? Genetics, environment, trauma, just plain fussy? Well here's one way. Take one stubborn 4 year old thumb sucker, tell her she must not put her thumb in her mouth because of germs, then proceed to google images of germs to really cement home the imminent danger of putting them in her belly.
Watch said toddler excitedly rewind over and over a scene in iCarly in which a character obsessively cleans his hands with "blue germ stuff" while warning Carly of the insidious nature of the zillions of germs on her hands, and you have a bona fide OCD taking firm root in the fertile psyche of the 4 year old mind. I'm sorry Ky and no way am I buying you "blue germ stuff".