Sans can't be afraid of that show--it's the exact kind of thing he'd do. "Everybody's makin' dramatic entrances today. You been doin' your homework?" You know, since he said he was like their collective kid and all.

Sayori is also not afraid. More amazed than anything. "Are you supposed to be scary?"

Because...he isn't......

And then, after a second, a realization: "Wait! That person laughing during the dance contest, was that you?!"