You think I would seriously joke about this crap!? [Yusuke's glaring right back as well.]

I screw around with you a lot, but this is seriously not one of them. I am a clone of the Yusuke you know. No, I don't know how it's possible. How the hell do you think I WOULD know? They didn't exactly make me a Harvard graduate!

[Honestly, listen to him try to explain this.]

Tell me what's got you confused.