If Ты were me, would Ты post this question?

no..i'd better go and sleep..or eat a pun cake

Well, I'd post it. Because I'd be Ты and not me, and Ты are posting this question.

If I were you, I would not be me, and if I were me, I would not post that question. Ты is the opposite of me, so Ты would do the opposite of what I would do, so if I were you, I'd post that question. Not to mention that if I were you, I'd do exactly what Ты would do, and Ты would post that question.