"Probably by being magic," Sans offers helpfully, before deciding to actually throw the poor guy a bone. Just a little one. It's not like magical biology was his specialty. He wiggles the ketchup bottle. "Monster food's made of magic, I'm made of magic. Soon as anyone eats it, it turns right into energy. You could say we're to-made-o for each other."

That one was pretty terrible--he's proud of himself.