Sans: *He automatically winces and curls into a ball, his hands on his head* S-stop... *Rocky keeps on cracking her bones while laughing at Sans' reaction* Please stop! *She keeps on cracking her bones* I SAID STOP! *Sans shoots to his feet and walks out angrily, the room goes silent*

Frisk: W-What... What just happened?

Flowey: Did Sans  just... "break down"?

Frisk: I... think so.... 

Papyrus: Oh, he's fine! This had happened... TWICE before!