Papyrus looks the sort of tired that Sans would diagnose as having spent a few days too many working on projects instead of taking an occasional nap, were they back home. It's not exactly the same look on Papyrus's human face, but close enough. Still, he has to recalculate all over again for human biology. Papyrus doesn't look as bad as the time Sans found him on the lawn, so that's something.

"You know me, the only thing I start are knock-knock jokes." He doesn't start things.

(But sometimes he finishes them.)