It would be pretty normal for a person to be at least a little bit offended that someone is suggesting that they aren't real, but all Sans can manage is a lifeless chuckle. His presence in the room seems to be fading now - waking up in the real world, maybe.

He's not sure whether he is eager to go or not. Some part of him instinctively knows that all of this is going to fade away when he does, and the thought fills him with a deep and pervasive feeling of anxiety. He slowly shakes his head.

"I don't think it works that way, kid," he says, hollowly."Not this time."

Whatever 'Papyrus' ends up doing...Sans knows exactly what he'll be waking up to, and it sure as hell isn't normal.