"No," he says, so very frustrated but incapable of fully expressing it. His tone is more dead than angry. "I'm not. I don't remember a lot of things right now, and I sure as hell don't remember you."

He really shouldn't be shunning someone he has every reason to believe is his actual family, but he can't get his head around it. He can't imagine how this 'Papyrus' fits into his life, or how anyone is supposed to deal with loving someone like him.

"It's not a fucking joke," he snaps, and then suddenly stops - the weight of some not fully understood error settling heavily on his shoulders. He didn't just say that. Since when would he say something like that to Papyrus?

Except...he doesn't know who Papyrus is.