Kakashi - he already has a case of pink eye. I heard it's like chicken pocks, you get it once then your immune.
Guy - If you dont look at the asshole directly, then you wont get pink eye.
Madara - Has mastered the pink eye crustyness. He laughs at farts directed at his face. He smoothers himself in the buttcheeks of assholishness. His pink eye is so devistating that if he establishes direct eye contact with you then you instantly have herpes.