That expression, that laughter... Just what is going on here? Sans doesn't seem drunk or anything. But he's out of it, unguarded in a way Papyrus just isn't used to.

"Well, no, not just now!" Utter exasperation. What an absurd question. "But now it's bad enough that I can't just let you pretend it's nothing. You can't even aim your secret teleportation right! You might end up in a wall."

And that's what normal for Sans; pretending all is well, especially when it's not. So if he wants somebody to tell him what normal for Sans the Skeleton is, he's just gonna need to wait for those memories.