Do you, Papyrus of Snowdin Town, solemnly swear on your very life to fight for King Asgore and the monster race, to uphold justice, to defend the innocent and wimpy, and to seriously kick evil's ass twelve ways from Sunday everywhere, all the time from now until you're dead in the cold, cold ground?

Hey, I didn't mean anything by it, Paps, relax. It's just... I never heard of a monster hurting themselves with their own magic, that's all. Not by accident, anyway.

Sans of Snowdin Town, you're under arrest, for domestic battery, assaulting a guardsman, threatening a guardswoman, resisting arrest, and obstruction.