[It's harder to convince someone who's confident, happy, and inherently unshadowed by fears or regrets, true enough. Appeals to emotions like guilt fly right by. But it's not impossible, especially if they have any inkling of the permanent danger that comes of half being killed.

Papyrus sighs, audibly, before answering.]

...I'll bite. Sans, why do you need that? It sounds like this is very important to you, but, this is better for me? I'm not distracted by all those unhappy things, the way you're sounding... And I'm in two places at once!

It's not twice as productive, but I'm sure he's doing something vaguely useful in all this panic.